"Want to commit double suicide with me?" Kaori's words echo in Kosei's mind. What can he do for her now, while she is still hospitalized? At the Aiza home, Nagi sees her brother Takeshi fall deeper and deeper into a slump and wonders how to cheer him up. Amid their worries, the teacher and student form a surprise duo for Kurumigaoka Middle School's festival. What will happen with two pianists on one piano?