Oniichan wa Oshimai!  

Onimai: Im Now Your Sister!, Onii-chan is Done For, お兄ちゃんはおしまい！, Onimai: I'm Now Your Sister!, Onimai, Onii-chan wa Oshimai!, Onii-chan is Done For!

Mahiro Oyama was an individual who enjoyed playing erotic games. However, everything changed when he woke up one morning as a woman. It turned out that his sister, Mihari, had conducted an experiment on him with unforeseen consequences. Despite the challenges, both Mahiro and Mihari were determined to continue their research. As for the future, it was clear that life would become even more bizarre.

Oniichan wa Oshimai! was released on Blu-ray in two boxes from April 19, 2023, to June 21, 2023.