第 1 集: 在祭典上,由香和夏樹鼓勵里子親吻後藤
2016年12月21日 播出原創回

1
While Yuuko, Natsuki and Riko are hanging out at the summer festival, she and Natsuki try to encourage Riko to share a kiss with Goto. Later, they mistakenly see that Goto is about to kiss a women other then Riko, (who is in fact, his sister) and go to beat him up. (Source: Hibike! Euphonium Wiki)