Onii-chan wa Oshimai!

Mahiro Oyama was an ordinary guy who loved to play video games...until he woke up one day as a woman! His little sister Mihari, a mad scientist, had conducted one of her experiments on him with a shocking side effect! Mahiro was determined to resume his regular life, but Mihari was equally determined to continue her study of him. As the two try to sort out this bizarre situation, it's clear one thing is for sure - life will never be the same again!