Anything that deals with Aiko after the sports festival.
The fact that Haruaki and the others diligently clean her, in pot form, while she's recovering.
When Haruaki and Fear discover proof that she is indeed still alive, because she was in what was equivalent to a coma, their glee over it is adorable.
All leading up to her return as part of one Big Damn Heroes moment. The first thing Fear does when seeing her is hug her.
After the Knight's Dominion occupy the school, Taizou and Kana, who Un Izoey saved from being caught in Taciturn Chatterbox's hypnosis, are told the secret about cursed tools and the organizations dealing with them. Naturally, this includes telling them about Fear and Konoha, Kirika and how she was a part of the Lab Chief's Nation, and the Yachi home. Once knowing, Kana and Taizou decide that it doesn't change how they view them. Once they get in contact with Haruaki and the others outside the school, they act like their usual selves.
