Meet your love interest (nameable). She’s referred to you all her life as Oniichan (relationship changeable). Affectionately, you also call her your little Sister (also changeable)!
You cohabitate in a small studio apartment. You’ll have to get along in this small area where you’ll spend a lot of time together. Through interacting with her, you build up a relationship that’s based on trust, friendship . . . and more! Talk to her and find out her favourite topics, play video games, and take her with you on day trips. Through your actions, she can come to trust you more, and, of course, you can also build her sexual attraction toward you. But be warned! You can also lose her trust in you.
Living Together! is a laid-back game intended to be played with one hand. Please enjoy this simple Oniichan game.
Thread Updated:: 2025-05-01
Release Date: 2025-05-01
Developer: – –
Censored: No
Version: 0.47 Subscribestar
OS: Windows, Linux, Mac
Language: English
Genre:
3DCG, Animated, Corruption, Dating sim, Handjob, Incest, Loli, Teen, Male protagonist, Masturbation, Point & Click, Romance, Simulator, Urination, Virgin, Voyeurism
Core Planned (This Year): Exhibitionism, Oral sex, Pregnancy, Vaginal sex, Anal
Extra Planned (After 1.0): Epilogue (playable segment with L.I. pregnant), Optional Fetishes, New Game+ and/or Endless Play
Never implemented: Rape, NTR, Scat
Installation:
1. Extract and run.
Changelog:
v0.47
N/A
v0.44c
- New Night Time Lewd Activity: Blowjob (unlocked after Hanami Weekend Activity). Blowjobs will added to the evening intimacy and bathing together as well, later.
- New Weekend Activity: Hanami:Take Imouto to a cherry blossom viewing park with you. This event has good trust and attraction gains on its own.
- Requires you to finger Imouto 5x prior and have 200 Trust and 160 Attraction.
- Costs 1200 Yen
- Unlocks blowjobs.
- There is a very high chance that you will discover an undiscovered Lewd Interest Topic during this activity.
- Going to Hanami will calm Imouto and prevent a bad mood from naturally occurring for 3 days (you can still ruin it yourself, though).
v0.43c
- HODL App: “Available Balance” renamed to “Limit”
- HODL App: All Options are now leveraged at 400% using other people’s money. You lose only the price change or up to your investment. But, you win the price change times 3 if you guessed correctly. These “other people” have their money in what they think is a mutual fund, but HODL is using it for decentralised Options trading using you and many others like you. Some say the real leverage is 450% and HODL skims off the remaining 50%.
- Day Traders: New Game Checkings Account Balance increases by ~300%. You start with large amount of capital from getting lucky before. Trade Options wisely with it now.
- Day Traders New Game Savings Account will now be 0 as they need everything for their trading.
- Going on a picnic after the first time will now correctly add 15 Trust.
- Christmas Special (Weekend Activity when you play between December 15 and December 31st)
- Fingering mechanic disabled. It is now an animated event.
- Several animation timing touchups to night-time fingering
- Tweaked and added Imouto exclamations during fingering.
- Doctor and Wild Oniichan can make Imouto orgasm with their fingers in half the time Best Friend and Longing Oniichan.
- Fixed: infinite loop cycling through the fingering scene at night.
v0.42b
- New Minigame: Permits, Please!.Salaryman Oniichan can play a 1-minute minigame by “working hard” at work. Permits, Please! is a “Papers, Please!”-like game where the player has to crossreference data on permit applications with documentation provided by applicants and ensure the permit data is correct. The more correct decisions (approving or rejecting), the higher the bonus payout. The player can also work up to a promotion this way, causing a +25% salary increase for just doing the regular work (“take it easy”).
- Currently, the player only has to cross-reference the formalities of a permit, such as name, serial number, type, and jurisdiction. Future updates will include more elaborate data types, like requiring the correct inspection stamps from other authorities.
- The minigame is optional except for Career Tiger Oniichan.
v0.41b
- Fixed "image not found….half_size_shiori_dialogue…line 34" when going to sleep. Happened when you didn’t do the laundry.
- Fixed hard error when going into the weekend regarding her clothes (Exception: DynamicImage).
- Fixed error when you choose not to peek on her bathing (Exception: The say screen (or show_function) must return a Text object." in "Scripts/evening_behavior .rpyc", line 1778)
- Fixed Laundry buildup as a Student doesn’t get cleaned in the evening as it should.
- HODL mutations doubled (2x wins and 2x losses compared to 0.41a) (does NOT require a New Game)
- Added a Timeout when interacting with Imouto in the evening. If you do nothing for 30 seconds, she’ll scold you and return to sitting.
- Fixed "Exception: Screen complaint_4 is not known." During Night Time Lewd Activity
- Removed Oniichans sexual stats from Health App for now. Will be replaced in future updates.
- Added Imouto’s sexual stats to S.I.S.T.E.R. app on a third tab (click dot at the bottom).
v0.40b
- Fixed Error: weekend_activity line 275 ‘attraction_level’ is not defined
- Fixed Error: evening_behavior line 1796 ‘overtime’ is not defined
v0.40
- Added New Weekend Activity: Karaoke
- Added New Evening Intimacy Mechanic: Cuddling
- Cuddling is fully animated (idle)
- Headpatting while cuddling (animated)
- Kissing (wholesome)
- Making Out (animated)
- Handjob (animated)
v0.39
- Added City Fair Weekend Interaction. You can go to the City Fair in the late Afternoon (15:00), and will last into the evening.
- Added Intimacy to Evening Interactions.
- Added Headpat Interaction (animated) to Evening Intimacy interactions
- Added Wholesome Kiss Interaction (animated) to Evening Intimacy interactions
- Reduced Trust & Attraction levels required to increase their respective levels:
- Level 2 from 100 to 80
- Level 3 from 250 to 200
- Level 4 from 500 to 400
v0.38 Subscriber Special
- Added 100 Subscriber Special (Find in the new Smartphone Camera App)
- Added Camera App to Smartphone with Replay (working) and Gallery (work in progress)
- Moved Rentacar to the BRAVE New World browser
- added Rollback and Skip to all VN elements (Pool, Picnic and Subscriber Special)
- Weekend Activities now skip to a shortened Narration instead of the full story if you already did them once. You can always watch them back through the Camera app.
- Narration Skip now also works on Weekend actions narrations.
- Close phone button (square) active area increased to 256px.
- Checkings will no longer automatically be moved to Savings on Saturday for Daytraders.
- Added a Grocery Store trip to Weekend Activities (no fee)
- Added an additional sound effect when clicking the Sound Effect Test button
- Fixed KeyError: 53 (or some other number) in Line 1009 of evening_behavior.rpy
- Lowered cost for Weekend Activities with Imouto (Shopping, Pool, Picnic)
- Fixed days repeating when going to bed between 0:00 and 0:59
- Improved mathematics behind HODL stock mutations. I am now 80% confident it is correct.
v0.37 Free
Initial F95 release
Developer Notes:
Key Features
- Believably beautiful Imouto, rendered in high-poly 3D. She could be real.
- Fully simulated Imouto, with more than 50 variable psychological metrics like interests, mood, lust, sexual interest, and more. She IS real.
- According to my estimates, Imouto can adopt more than 30,000,000,000,000,000,000,000,000,000,000,000,000,000,000 (that’s 30 with 49 zeroes) possible personas. These personas are seeded so they remain believable.
- Build Trust and Attraction through a deep dialogue system and actions; lose her trust and sexual interest in you by messing things up.
- Spend leisurely days with your little sister, talking, flirting, bathing and potentially having sex with her (future update) — if she trusts you enough and is attracted to you.
- Get closer together, really…close…together.
- Be a creep and spy on her as she bathes or uses the toilet. Be careful; you might get caught!
- Beautiful “1K Apato” Apartment with day-night cycle.
- Energy, time, money, household management, and other systems were added and planned!
♥ ♥ ♥
Game Mechanics (Implemented)
One-handed gaming
Build Trust
Trust is the most critical aspect of this game. If she trusts you, she will be open to going further. Fail, and she might even decide to call Mom! Most of everything you do when you interact with her is also (co-)dependent on her trust in you. Even if she finds you highly sexually attractive, without trust, she will never dare to confess her feelings to you. The best way to build trust is to talk to her, do fun activities with her, and refrain from doing things she dislikes.
Build Attraction
She will only see you as a big brother or friend without attraction. With enough attraction to you, you may initiate sexual activities, and she won’t reject you. Without lust for you, anything of a sexual nature will lead to a swift dismissal…and her losing her trust in you! Low trust, high attraction, and you’re just a masturbatory fantasy for her. High trust, low lust, and you’re friend-zoned. There is a middle ground you have to find. Building her desire for you can be done through flirting, talking about lewd topics and later by engaging in sexual activity that she finds pleasant.
Interest Matrix
She is modelled with a realistic, comprehensive psychological matrix that is randomised using a seed. This means her exact psychology and interests will differ from playthrough to playthrough! Seeded means it is neither completely random nor set in stone. Each of her over half a googol (10^100) of persona types is believable.
By interacting with her, you can discover her interests and even broaden or deepen her interests.
Discussion Topics
You can build trust by finding discussion topics that strike a chord with her, e.g., that are interesting to her. The higher the interest, the more trust you can build with her. You always get 1 Shared Interest that you can choose at the start of a game. You can find out other high-interest topics she likes by discussing with her regularly and on various topics. You get to discuss each topic once a day.
Story Events
You unlock Story Events, usually day or weekend trips, by building trust or attraction. These events can increase her trust, lust or mood for the better or the worse. By bonding with her during these events, you can increase her trust in you or desire for you.
Lewd Topics
Sexual interest and attraction can be built by discussing lewd topics. She will naturally be interested in these topics as she’s of that age. But, being completely inexperienced, she will take time warming up to discuss these topics openly with Oniichan. Her having high trust in you is paramount, especially when you take those first careful steps.
Mood
Like everyone, Sister has emotions expressed in a general mood. This can be bad, normal, good, happy, embarrassed, etc. Unlike most modern women persons, Sister is well-adjusted, and generally, her mood is normal and stable. Even if she’s on her period or not feeling well, her surface mood should be normal most of the time.
But anyone can have a bad day, and your actions can also sour her mood. Luckily, Oniichan can also try to lighten his little sister’s mood with games or by cheering her up. Her mood will also influence the trust you can build up from other actions and how receptive she will be to sexual advances.
Menstrual Cycle
She has a menstrual cycle, going through 4 phases on a 21 to 25-day schedule. Her phase in the cycle will influence her mood and her sexual desire. It will also determine her chances of getting pregnant. Certain Oniichans can smell when she’s on her period or ovulating. Other Oniichans can try to work out her schedule using the calendar in the room.
Customisable Oniichan
Choose your history with your little sister, each option giving you different advantages and disadvantages when you start a new game. Examples are knowing her favourite discussion topic, having higher trust or attraction, or even knowing when she’s on her period.
Career path styles will influence how much money you have to spend and how much time you get to spend with her in the evenings. A student will be home when she’s home, giving you maximum exposure time every evening. A part-timer will be home later but has more disposable income to spend on his little sister. Current career paths are:
- Student
- Part-Timer
- Full-Timer
- NEET
- Day Trader (subscribers)
Day – Night and Week Cycle
The game has a perpetual day/night and week cycle. During the days, you’ll be at work or at school (or laze around in bed if you’re a NEET!). You’ll find yourself in her company at home during the evenings. That’s when most of the interaction with her happens. Weekends work a little differently since you’ll be together all day. That’s also when you can enjoy each other’s company outdoors and make happy memories together. These activities can cost money but are essential for bonding.
Depending on the scope of the activity, this features a visual novel story with potential extras. PLANNED: specific weekend activities based on specific interests she may have or develop.
Energy Management
Every action costs energy, and you have a finite pool of energy (indicated by your smartwatch battery). You can also regenerate energy through relaxing activities like drinking tea, soda, or bathing. Quality sleep at night is the best way to regenerate a chunk of energy.
♥ ♥ ♥
Planned Game Mechanics
I want to include this in the game before I call the Alpha done. This list may change in the exact details or by adding/scrapping ideas altogether.
- Night-time wholesome and lewd interaction (a major part of the game!)
- Nude bathing together with wholesome and lewd interaction (a major part of the game!)
- Additional weekend outdoor activities (an important part of the game).
- Weekend activities are based on her interests (long-term wishes).
- Good and Bad Endings: when she gets pregnant by you, the game ends, and there will be good and bad endings. Good endings involve high trust and having enough resources to make it work.
- New Game+ (either continue after an ending or indeed start over with some inherited benefits)
Win/Linux: – – – –
Mac: – – – –
Extras: * – * – * –
*This unofficial port/version/mod is not released by developer, download at your own risk.






