Naruto: I Get Stronger by Dying of Embarrassment

Standing before you is the Ninja World’s one and only designated ‘Batman,’ the ninjutsu master who pioneered the all-new ‘biological’ style, the master of Samehada among the Seven Ninja Swordsmen of the Mist, and the renowned black-market literary genius Hoshigaki Yangyan! P.S. This story is also called “Kisame: My Stepmom Calls Herself Batman and Named Me Robin”