I didn't really think about it until the end, but Aiko's statement of how if Punpun lied to her, she would kill him was likely exactly what her mom told her every day. Her mom's control destroyed both their lives, and it took both of them to finish her off. I'm not sure I entirely understand...
Are we not at all curious as to why Yoshida's parents have a car with a fuzzy dashboard?
Also, I imagine Emoji mk2 is part of the delinquents because she isn't planning on university. Either that, or making buddies in the arcade getting Yoshida some cute plushies.