Hiroomi Nase

Nase Hiroomi is the eldest son of the famous underworlder Nase family and Mitsuki's elder brother.

It appears that Hirooumi and Akihito had something happen between them in the past, but now they are on such good terms that they can joke around with each other. He has a little sister complex. Due to his barrier powers as an underworlder, he is extremely sensitive to cold, and is almost always seen wearing a muffler or scarf.