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Hiro'omi NASE / voiced by Tatsuhisa SUZUKI
Height: 178 cm (5'10") / Blood type: B / Birthday: February 21

Hiro'omi is the eldest son of the famous Nase family. He's Mitsuki's older brother.
At some point in the past, there was some trouble between him and Akihito. Nowadays, though, they're close enough to joke around with one another. He's a tremendous siscon.
As an unfortunate side effect of his xenomachics, he's extremely sensitive to cold, so he always wears a shawl and a muffler.
High school third-year.

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