美桜 悠華

Aika's younger sister, and also Aoi's childhood friend as well. Opposite to her sister, Yuuka is a very gentle girl with large breasts.

She played with Aoi a lot when they were kids, and still enjoys doing so. She's a sweet, lovey-dovey girl who would do anything and everything for her partner.

She seems to be very embarrassed about her prominent bust size.