Onii-chan wa Oshimai!
Description:
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](https://www.melonbooks.co.jp/circle/index.php?circle_id=3753)
 [Official Toranoana](https://ec.toranoana.shop/tora/ec/cot/circle/2UPA116P847KdC6Rd687/...