Gora is Yumoto's big brother, who loves him dearly. The two seem to have a wonderful relationship together. They both run Kurotama baths.
Both Ryuu and Yumoto seem to get along well, and are commonly seen interacting in a friendly manner throughout the series.
Like Ryuu, Io and Yumoto seem to get along fairly well. Though Io is focused on money the majority of the time, he can be seen acting friendly around Yumoto.
Atsushi, along with En, see Yumoto as a child. Not only that, but it's rather clear that they believe they're his parents.
En, along with Atsushi, see Yumoto as a child. Not only that, but it's rather clear that they believe they're his parents.
So far, they've only interacted in the manga and Otome formally. Yumoto seems to enjoy spending time with Kinshiro immensely, ecstatically pulling him around the arcade. Kinshiro was surprised, but they still managed to have a good time.
Akoya dubs him as a "fluffball," and doesn't seem to interested in getting to know him better.
The two seem to be friendly with each other, occasionally interacting in both the manga and Otome.
Yumoto loves cuddling Wombat whenever he can, to Wombat's dismay.