Ao Nishizaki is a member of the school trio known as MM3, alongside Ushio Toujou and Namito Nagumo. Despite frequently skipping classes and engaging in troublemaking behavior, he is a prodigious student who consistently achieves high academic marks. He harbors romantic feelings for his classmate Mimi, who is exclusively interested in Toujou, leaving Ao’s affections unreturned. His charismatic, princely demeanor contributes to the group’s identity as troublemakers who defy school regulations and clash with Mimi in her role as class president.