Hinako's senior who comes to join her for a bath.

"First muscle training animation ever," a 16-year-old girl named Hinako leads exercises in push-ups, sit-ups, and squats. Hinako was once a human, but she was turned into an anime character when she was a second-year middle-school student.
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(Source: Anime News Network)

Viewers take an exercise in the bathtub and an after-bath stretch with Hinako and the new character Hiyoko. A microSD card containing the OVA data will be bundled with the DVD so that users can watch the anime on their cell phones.<br><br>
Stretch Time segment included.