Height: 140 cm (4'7")
Weight: 36 kg (79 lbs)
Blood type: AB
Song: Kagerou Days, Otsukimi Recital
Hibiya is a young boy with short light brown hair and brown eyes. He wears a white vest with a hood over a blue shirt. He also wears brown shorts and black sandals.
First appeared in Heat-Haze Days. A boy that visits the city to take summer courses with Hiyori. He is known to be very mature for his age, yet has a cheeky personality. His quarrels with Momo are endless. On August 15, he becomes involved in a certain incident with Hiyori.