Chino is chosen to have a solo part at a concert. Chino asks Rize to help her get accustomed to singing in front of others, and so they have a karaoke tournament. But, as Chino practices, everyone gets overly excited about the upcoming event, making Chino nervous.

Source: ANN

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Prequel: Gochuumon wa Usagi Desuka?? Dear My Sister
Sequel: Gochuumon wa Usagi Desuka? Bloom