Hiyoko

Hiyoko has some appearances as a guest star in Isshoni Training/Training with Hinako, a training/exercising OVA where Hinako would show you to exercise with her, along with Hiyoko as her leader and friend. She also appears on the third and final OVA, titled Isshoni Training 026: Bathtime with Hinako & Hiyoko, that was released on December 24, 2010. It goes back to exercise, however it is intended to be watched in the bathtub, since it's part of the "illusion" of taking a bath with Hinako. The first half shows stretching exercises for the viewer to follow, similar to volume 1, however the second half switches to a narrative showing Hinako's petite friend Hiyoko visiting, which is meant to be the viewer's "reward" after the workout. This part of the OVA consists largely of sensual imagery of the girls washing each others' bodies. A bonus workout, "Drying with Hinako" is also included.