My Sister, My Mistress
My Sister, My Mistress is made and published by Interactive Studio Inc. AppBrain is an independent app data site and isn't affiliated with Interactive Studio Inc. The app name, icon, screenshots and description belong to Interactive Studio Inc. and are shown as published on Google Play.
AppBrain's verdict
Niche- Rating on Google Play
- 4.71
- 26 ratings
- Installs
- 5.1 thousand
- Last updated
- July 24, 2026
- Ads
- Contains ads
- Size
- 47.7 MB
My Sister, My Mistress is a niche app, with 5.1 thousand installs. It doesn't have enough ratings yet to judge what users think.
Summary
Dive into a dark, character-driven SIMULATION set in high school, where a stepsister’s dangerous secrets test friendships and loyalties.
Pros & Cons
- High rating from a dedicated, though small, user base
- Free-to-play entry lowers barriers to start
- Distinct cast with varied relationships (Reika, Seri, Yoshiko)
- Dark, twisty narrative that blends school life with psychological drama
- Not ranked in any top lists
- Ratings come from only 26 users, a small sample
- Uses ad/analytics and notification permissions common to free apps, which may affect privacy considerations
- Some players may seek broader genres like romance, puzzles, or action not present here
User feedback
Ratings and reviews on Google PlayComments on My Sister, My Mistress for Android
Google Play Rating history and histogram
Store listing
By Interactive Studio Inc., from Google Play“Will you surrender to your sadistic stepsister’s twisted desires?”
Description by Interactive Studio Inc. Written by the developer, not by AppBrain. Click to read.
After living alone with your father for the past ten years, he suddenly announces that he’s getting remarried—and you’re getting a stepsister! At first, you're relieved to find out she’s one of the kindest girls at school… or so you thought. In truth, she’s a sadistic bully—and now she’s blackmailing you!
Can you keep this twisted secret from your best friend and the classmate you’ve been ordered to spy on?
How will you survive your new life with a sadistic sister?
■Characters■
◇Reika◇
Reika is the most popular girl in school and top of the class. When you learn she’s going to be your new stepsister, you think you’ve hit the jackpot. But her angelic school persona is a lie—at home, Reika is sadistic and cruel. Can you break through her twisted mask and save her from herself?
◇Seri◇
Your sporty and competitive best friend, Seri always makes time to hang out with you at the arcade, where she dominates the high scores. As you try to shield her from Reika’s wrath, you start to realize your feelings for her might be more than just friendly…
◇Yoshiko◇
Yoshiko is a quiet, bookish classmate who recently caught your interest. You bond over your love of reading—but Reika has ordered you to spy on her. The more time you spend with Yoshiko, the closer you become… Can you betray her trust?
Safety and technology
Found in the app by AppBrain- Ads
- Contains ads
- Price
- Free
- Libraries
- ?
- App size
- 47.7 MB
- Content rating
- Medium
Technologies used by My Sister, My Mistress
Releases
Updates seen on Google Play- Version
- 3.0.0
- Launched
- August 2025
Alternatives
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Installs
Tracked by AppBrain- Last 30 days
- 130
- Play install range
- 5+ thousand
- Launched
- August 2025
Installs over time
My Sister, My Mistress has been installed 5.1 thousand times. Over the past 30 days, it has been installed 130 times.
Rankings
Google Play top chartsGoogle Play Rankings for My Sister, My Mistress
About the app and developer
About My Sister, My Mistress
My Sister, My Mistress is a simulation app developed by Interactive Studio Inc.
Install Statistics
My Sister, My Mistress has been installed 5.1 thousand times. In the last 30 days, the app was installed 130 times.
User Ratings
My Sister, My Mistress is rated 4.71 out of 5 stars. The rating is based on 26 ratings.
App Information
My Sister, My Mistress is freely available from Google Play. The app size is 47.74 MB. The latest version available is 3.0.0. The last update was on July 24, 2026.
Technical Requirements
The app has a content rating of Medium Maturity. The app has been available on Google Play since August 2025.
App Performance Report
Get a detailed PDF report for My Sister, My Mistress with download trends, rating history, and key performance statistics — useful for competitive research or tracking your own app. Learn more
Get PDF Report — $29Developer information for Interactive Studio Inc.
Frequently asked questions about My Sister, My Mistress
Is My Sister, My Mistress free?
Yes. My Sister, My Mistress is free on Google Play.
Is My Sister, My Mistress still available?
Yes. My Sister, My Mistress is on Google Play, and the last update we saw was on July 24, 2026.
Does My Sister, My Mistress contain ads?
Yes. Google Play lists My Sister, My Mistress as containing ads.
How large is My Sister, My Mistress?
My Sister, My Mistress is 47.74 MB.
Is My Sister, My Mistress suitable for children?
Google Play gives My Sister, My Mistress a medium maturity rating, so it is not meant for young children.
How many times has My Sister, My Mistress been installed?
Google Play lists 5,000+ installs for My Sister, My Mistress.
How do people rate My Sister, My Mistress?
My Sister, My Mistress scores 4.71 out of 5 stars, from 26 ratings on Google Play.
Who made My Sister, My Mistress?
My Sister, My Mistress was developed by Interactive Studio Inc. It is listed in the simulation category on Google Play.
What are the best alternatives to My Sister, My Mistress?
People looking at My Sister, My Mistress also look at these simulation apps: High School Vampire Love Story, Couple Breaker: Romance Otome, Dark Romance 8 f2p, Connected Hearts: Beauty f2p, Match Girl's Dream:Tricky game.