Age: 16
Height: 176 cm (5'9)
Weight: 67kg
Birthday: January 15 (Capricorn)
Affiliation: High school student

When he was younger, Masahiro had orange hair and usually wore a white button shirt with a small chain necklace.

Currently, he is seen mostly in his high school uniform. He has blonde hair longer on top in proportion to the sides and small, green eyes. He maintains a chain necklace on his neck and has piercings on his ears.
Later in the book, he wears a chain with a ring attached to it as a necklace.