Yuusha Ni Minna Netoraretakedo Akiramezu Ni Tatakao Raw Free ((new)) -

Netorare is a subgenre of adult fiction (often in manga, anime, and visual novels) where a protagonist's loved one is seduced or stolen away by another person — often a rival, a friend, or in this case, a "hero." Unlike simple cheating, NTR focuses on the psychological anguish of the person being "left behind."