It was pretty obvious to anyone at PK academy that Saiki Kusuo and Satou Hiroshi had crushes on each other, they weren't exactly subtle with their soft glances, lovesick sighs and wistful eyes. So when some saw the smile on Saik's face, it was quite obvious who had been the cause of it, as there was only one person who had such an effect on the usually quite stoic boy. (Saiki Kusuo/Satou Hiroshi)