Synopsis

Mahiro Oyama was just an ordinary guy who loved playing erotic games… until one day he woke up as a woman! His crazy scientist sister, Mihari, had been experimenting and accidentally changed him. Mahiro wants to return to his old life of playing games, but Mihari is eager to study him. Things are about to get very strange!

(Source: Kodansha USA)

Note: Contains 57 additional chapters.