Chihaya's pre-show spiral spirals everyone with her. What starts as one girl's last-minute panic rehearsal becomes a completely unhinged chain reaction where the girls keep getting pulled into stranger and stranger situations, each one somehow both ridiculous and weirdly touching. The show knows exactly when to hit you with genuine character moments between the chaos, turning what could have been a throwaway bonus episode into something that actually lands.

On the day before the 765 Productions Fan Appreciation Event, the idols get ready to go home, but Chihaya Kisaragi feels uneasy about the show and decides to squeeze in one more rehearsal on her own. One thing leads to another, and Chihaya, Miki and Haruka end up swept from one lively situation to the next. Their day raises questions about where a truck driver is really headed and what secret an old house holds, and it is uncertain whether the girls will reach the event in time. Along the way, the other idols of 765 Productions join them for a comedic musical adventure told in a single OVA episode.