Dating-sim master Keima Katsuragi would rather conquer girls in games than talk to them in life, but his demon partner Elsie keeps dragging him into the real thing. When Elsie, Chihiro, Ayumi, and Miyako start a band and ask for a clubroom, their teacher sets a condition: every one of them has to score full marks on the next English test, so they turn to Keima for help. Then the national idol Kanon Nakagawa announces she will headline the school festival stage, and Chihiro decides the band will go up against her. This OVA is a side story to the television series.