ONIMAI: I'm Now Your Sister!, Volume 1

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

Next Volume: ONIMAI: I'm Now Your Sister!, Volume 2

One day, loser shut-in Mahiro was suddenly transformed into a girl by his little sister Mihari, and now he's forced to adjust to his new life as a she! Mahiro...

Most Recent Volume: ONIMAI: I'm Now Your Sister!, Volume 5

This brother has girl power of monstrous proportions! Former twenty-something shut-in Mahiro Oyama was transformed into a girl by an experimental drug, and now he's celebrating birthdays, buying bras, and...