Oniichan wa Oshimai! is a Japanese anime series that follows the story of Mahiro Oyama, an ordinary guy who becomes the subject of his little sister Mihari's scientific experiment. This unexpected transformation leads Mahiro on a comedic and challenging journey of self-discovery. The anime explores themes of identity, family, and the humorous consequences of scientific curiosity. Released in 2023, the series has garnered attention for its unique premise and engaging character dynamics.