Oh, Oniichan!
About Oh, Oniichan!
Oh, Oniichan! is a text-based hentai chat game made by Tiny Secret Games in Unity. You play as a brother whose sister has just turned eighteen and wants to launch an OnlyWaifus page. The story centers on chatting with Sera-chan, deciding whether to support her, and unlocking pictures as the relationship grows. Sessions are scheduled in real time, so you experience the week through short phone-chat visits. You can also choose how she is named and how she addresses you, with Sera-chan and Oniichan as defaults. The presentation uses 2D AI CG art and themes of romance, teasing, and text-based interaction.
The current build is v1, released on March 30, 2025. Development is ongoing, and the latest changelog describes it as an initial zone release. The game is available on Windows, uses English, and is uncensored.
Developer's description
Your sis turned 18 and wants to start her own OnlyWaifus page. Will you support her? Enjoy chatting with Sera-chan in this hentai chat game. As the story progresses, you can unlock various pictures of her and develop the relationship from innocent photo sharing up to so much more. Realistic Phone-Chat Chat with your sis about her dreams and sexual preferences in a realistic Phone-Chat simulation. Chat sessions are scheduled in real time for more immersion. You will play this game in short sessions to experience the story over the course of an entire week. Chose Her Name You can decide how she is called and how she will address you! By default, her name is Sera-chan and she will call you Oniichan.
Oh, Oniichan! screenshots
Download Oh, Oniichan! v1
Changelog
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