Synopsis: ONIMAI: I'm Now Your Sister!

Onii-chan wa Oshimai! / Ab sofort Schwester! / お兄ちゃんはおしまい! / Мій братик вже не братик / Мой братик теперь не братик! / 别当欧尼酱了！ / 不当哥哥了！ / Onii-chan Is Done For! 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! *5th place of Tsugi Manga Awards, Category Webmanga - Retail: (Direct Retail From the Mangaka)  Official Melon Books  Official Toranoana  Official DLSite (jp)