Mixed feelings, MC wasn't so dumb to not notice the details about his girlfriend (Kana)'s behavior when they had their "first time" sex together (he quickly realized she wasn't a virgin), then didn't pretend it wasn't her the one on the videos (neither cried about it while jacking off and then keeping quiet about it) and confronted her, that was ok so far but he forgave her at the end, yeah, despite her cheating it still ended on a happy note with her going back to her boyfriend and moving away but this time with him aware of her sexuality and likely her new sexual urges after being toyed with and trained. Also, the yarichin and his buddies got arrested since he was so stupid as to stream on-line the orgy with Kana, and regarding her, well despite she was the victim of this she still got socially killed and had to drop school as she literally got ostracized and had no friends left beside MC, they moved away from their hometown to a city she's not known for her past deeds and she claims to want to stay with MC and she only needs him in her life.