Ótanii kara no hakjoku sengen!! (E22)

Pursuing his dream of becoming a grade school teacher, Ōtani begins going to cram school. Lisa is lonely as Ōtani is too busy with his studies, and she begins working at a family restaraunt. That's where she meets and rapidly gets close with a Umibōzu fan called Kohori. One day, Ōtani sees Kohori kiss Lisa! When Ōtani lays into Lisa, she calms him down with the explanation that Kohori kissed her while she was sleeping. But then Lisa agrees to go to a live Umibōzu concert with Kohori. Outside, after the concert is over, Ōtani catches her cheating on him. He tells her that he wants to break up. (Crunchyroll)