Board Thread:General Discussion/@comment-28592066-20160625123501

According to the basement tapes Ryoba's kidnapped Ayano's father, probably forced him into marriage and parenthood, so I think it's also very likely that the final rival is Senpai himself - I mean, not a typical rival (because you can't kill him), but something along the lines of being resentful against Ayano (after all other rivals are eliminated) so you have to kidnap him or otherwise do something to him to make him yours. 