Kirino's ending is sadder than any anime death ever and that's a fact.

the extra with adult Kirino, his eyes look kinda dead.... I hope they are not hinting that he'll become a second Yanagida-sensei. Even if he doesn't, his dead eyes mean he gone back to the Kirino he was before befriending Mishima. Poor kirino, i was not expecting this when i started this manga (with its at the beginning silly and cliche bullying plot)