Onii-chan Asobo
Released Sep 2019
"Let's play Onii-chan" is a Slice of Life/Eroge Kinetic Novel about a developer of AO-rated games and his younger sister, who wants to become a developer too and intends to learn by doing things.
73% positive · 342 reviews
Done
All announced content has been released
High confidence
Done
All announced content has been released
High confidence
Where to buy
Steam $8.99
Can't confirm — worth a look
We couldn't confirm these stores carry this game.
Green Man Gaming Steam key Search IndieGala Steam key Search Prices in USD, as listed by each store.
Buying through an affiliate store helps support the site
Evaluation
Onii-chan Asobo is a kinetic novel (a type of visual novel with no branching choices) that released on September 27, 2019. The store description presents the game as a self-contained story with a defined set of content: 50+ CGs, an original soundtrack, and a complete narrative premise. There is no DLC, no post-launch update history, no developer communications about future content, and no roadmap or announcements of any kind. Kinetic novels of this type are characteristically shipped as finished products. The game launched complete and there is no evidence of any post-launch content development.
Evidence
Store description presents a fully self-contained kinetic novel with a defined content set: 50+ CGs, original soundtrack, and a complete story premise. No mention of future updates, DLC, or additional content.
Short description confirms the game is a kinetic novel — a format that is characteristically released as a complete, finished product with no ongoing content cycle.
Details
Developer
Publisher
ilシ
Achievements
1
Platform
Windows
Controller
partial support
Steam Deck
Playable
Players
Single-player
About this game
Genres: Kinetic Novel, Eroge, Slice of Life, Romance.
Koichi Akiyama, an ordinary 22-year-old game developer, has been living a boring life until one day his younger sister Ai paid him a visit.
Soon after Ai moves in with Koichi, she claims that she wants to become a game developer too, so her brother has to teach her everything he knows.
The only problem is that Ai wants to create Hentai games, which puts Koichi in a dubious position.
From now on these two need to learn how to work together and explore all the difficulties of writing Hentai stories.
Koichi Akiyama, an ordinary 22-year-old game developer, has been living a boring life until one day his younger sister Ai paid him a visit.
Soon after Ai moves in with Koichi, she claims that she wants to become a game developer too, so her brother has to teach her everything he knows.
The only problem is that Ai wants to create Hentai games, which puts Koichi in a dubious position.
From now on these two need to learn how to work together and explore all the difficulties of writing Hentai stories.
- HD 1080p window & full screen options
- 50+ Beautifully illustrated CGs
- Original Soundtrack
Are these done yet?
Last evaluated Jun 26, 2026
Something about this evaluation looks wrong Report illegal or harmful content