Isohachi is a bald, elderly man. He wears a casual business attire with a v-neck sweater vest over his long sleeve collared shirt and a bolo tie around his collar.
Not much is known.
Main article: Introduction Arc
When Sōma Yukihira arrived at Tōtsuki's admission department, the employees at the front desk, was confused about the Polar Star Dormitory on his notice of admission. After Sōma left the building, Isohachi appeared to check on his fellow employees. They asked him about Polar Star, which Isohachi describes as a former refined, Western-style house.
- Hasegawa (長谷川) literally means long valley river.
- His given name (五十八) is a word play on his age, which means fifty-eight.
- Isohachi did not debut in Episode 4, where his scenes from the manga were removed.