Haru

A courtesan working in the brothel run by Oogiku.
With her motherly demeanor and knack for looking after others, Haru is highly esteemed. Being the top income-bringer in the brothel, getting a reservation for her company isn't easily achievable.

Haru has been an important figure in Isamu's life, serving as his playmate since childhood. He views her with immense respect and deference, feeling he can't overstep her.