His Chasm (ヒズ・キャズムHizu Kyazumu) is the twentieth episode of the Golden Time anime series, which aired on February 27, 2014.
After Chinami admonishes Banri for being too friendly with Linda because she's the girl Mitsuo likes, Banri catches up with Koko to share everything that happened. Koko and Banri talk about Chinami, and they both realize that they are ok with their former likes liking others. Banri then considers giving Koko his mother's ring as the moment is perfect, but realizes he didn't bring it. Back at his apartment, Banri considers when he can give the ring to Koko and wonders who he can talk to about it. In the morning on the way to school, Banri runs into Nana and tries to talk to her during the train ride but realizes she isn't in the mood to talk about anything before falling asleep on Banri. At the school, 2D, Koko and Banri talk about Mitsuo's strategy to keep filming the festival club, and when Mitsuo and Chinami arrive, Chinami convinces Koko to go with her to get Belgian chocolate, leaving Mitsuo, 2D and Banri to discuss Mitsuo's failure to get any closer to Linda. Mitsuo points out that Koshino seems to be protecting Linda from Mitsuo, but they realize class is about to begin and run off. After class, Banri meets up with Koko and they decide to go to the Woodstock Cafe, where they talk about their immediate future, both very happy about the pleasantness of their days lately. At school the next day, while Banri is considering how to give Koko his mother's ring, he is accosted by the Tea Club girls who discover his plan and make him extremely nervous about it before trying to recruit him again. Koko arrives for them to go to Festival Club practice, where three fourth years have decided to join for the upcoming performance, and Banri and Koko see how Koshino seems to be protecting Linda from Mitsuo. Later, at the train station, Banri and Koko talk about everything happening. Later, at the performance, Mitsuo renews his focus of filming the Festival Club, while Linda points out that Koko isn't nervous as she tries to help the fourth years. During the actual performance, while Banri considers how wonderful his life is going, he then has a mental break as his past self reasserts itself and he freaks out, running off. Linda and Koko go after him, with Linda finding him later as Banri tries to figure out what's happened to him. When Linda brings up Koko, his new self returns, but now Banri fears that old Banri is going to take him over again.