Hirono Watanabe
About
Hirono is Seono's twin brother, and Yuuma's childhood friend. After Seono dies, Hirono still blames himself for leaving the family and not protecting him. He is friends with Ruka and lets him live with him after Ruka's apartment complex burns down.
Hirono had feelings for Yuuma, but gave him up after Yuuma had a daughter with Seono.