While taking a drive on the highway to try a "100-mile blend" of coffee, the girls stop by a service area, where they find cans of coffee with motorbike figurines included. Rin manages to obtain a figure of her Katana, only for it to get run over. Later on, everyone's bikes simultaneously break down due to an alleged curse, but they are soon aided by Raimu. Onsa becomes upset when she discovers the café serving the blend has been shut down, but Hane cheers her up with a can of coffee she had saved during their 100-mile journey. Afterwards, the girls enjoy a hot spring before returning to buy Rin a new figurine. An OVA of Bakuon!! bundled with the manga series' seventh complied volume.

After Hijiri finally obtains her own motorcycle license, she has one final ride with Hayakawa, who experiences mysterious rejuvenating effects and reverts to a younger age, revealing his true identity as a female maid. Confused by the circumstances, Hijiri attempts to hide Hayakawa's identity when the others come over to visit to see her new bike. Jealous of Hayakawa getting everyone's attention, Hijiri rides off on her own, only to run into some trouble when her bike topples over. Remembering that which is most important, Hayakawa returns to her normal appearance as an elderly butler to help Hijiri.