On her way to her first day of school, Hane Sakura takes interest in her classmate, Onsa Amano, after seeing her ride a motorbike to school. The two go to the school's Bike Club, whose only club member is a silent girl in a helmet named Raimu Kawasaki, who takes Hane for a ride on her Kawasaki ZX-12R. After joining the club alongside Onsa, Hane applies for a motorcycle license, initially struggle with lifting a bike but managing to pull it off after seemingly hearing a voice coming from her bike. During her lessons, Hane comes across another classmate, Rin Suzunoki, who takes her and the others to a bike shop to pick out a bike, only to argue with Onsa when she disses her taste in Suzuki bikes.

With Hane now having her license, the girls visit the Nicoichi Motors used bike store, which turns out to be Onsa's family business. Despite the poor condition of most of the bikes on sale, Hane decides to buy a pink Honda CB400SF Hyper VTEC Spec III that catches her eye. Later, the girls overhear Rin being cheerful after a microphone is installed in her helmet, encouraging her to join them on the trip. Afterwards, the girls learn that the Bike Club has been defunct for twenty years and look to getting it reapproved, while Raimu and Tazuko, the school's headmistress reminisce about how it came to be defunct in the first place. After Raimu promises to protect the other girls from harm, Tazuko presents Raimu with a new Student ID and has the Bike Club officially reinstated.

The gang plans a road trip to Hokkaido for the summer. It becomes a grueling overnight race to the hot springs.

The gang wakes up in tents in Hokkaido. They make a trip to the northern edge of the prefecture, where they run into someone they didn't expect to see.

The school festival is coming up. The gang prepares for their event: a bike race.

The crowd for the gang's school festival event is huge. Even the principal is betting.

The gang exchanges gifts for Christmas, and bike to Inubousaki to watch the first sunrise of the year.

It's the end of the school year and the beginning of the next. Raimu-senpai's graduating, and all the clubs, including Bike Club, are desperate for new members.

Chisame is an undefeated minibike champion. The gang wants her in the Bike Club, but she falls a bit short.

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