第 4 集: 真冬加入樂團，里塚練習吉他，春希收到現場演出邀請。
2019年8月2日 播出
Mafuyu finally decides to join the band. In order to compose a song to go along with the little tidbit that Mafuyu sang for him, Ritsuka dives back into playing guitar nonstop. Haruki is at his part-time job one day when his friend Koji Yatake comes by and asks him if he and his band would like to appear in a live show he’s putting on. Ritsuka is teaching Mafuyu guitar at school as usual and then invites Mafuyu to go look at effect pedals with him. (Source: Crunchyroll)