Oniichan wa Oshimai

Mahiro Oyama (you) was just a normal erotic-game loving dude…until you woke up one morning as a woman! Turns out your mad-scientist little sister, Mihari tried out one of her new experiments on you…with a disastrous outcome, as far as Mahiro’s concerned! But Mihari is as determined to study you as you is determined to go back to your shut-in, game-playing life, and one thing’s for sure…life is going to get a whole lot weirder from here on out!