Younger brother of Kohaku, son of Yoshino, husband/boyfriend/roommate of Argo

Adopted as a young child by Yoshino, he was an awkward child and an un-diagnosed autistic. Mother was abusive, treating him poorly due to his very specific, and sometimes strange or extreme needs. An indicator of why he was probably put up for adoption to begin with (impatent parents). Hachi needs space and lots of time, and she'd all but freak out for not wanting to hug her, not showing love or being a "normal kid". At one point, she hits Hachi. Yoshino divorced her for this, and is a phenomenal dad who got Hachi the help he needed, and took drastic measures to ensure his happiness as he takes pride in his sons

Having a positive upraising after the incident, therapy and a lot of patience, he ends up at an older age being able to move out and into an apartment of his own. Working as a mortician and a very respectable one at that due to his passion for his work, he quickly becomes content in life

Talking to his therapist on the phone, he is later told that perhaps as a way to finally start socializing as he is lonely and started wanting companions, would be to get a roommate since he has the extra room. He is upset by this but slowly ends up doing such. Argo answers his ad after thinking that the "flexible rent ;)" meant sex. The rest is history, with a lot of antics. Argo is a polar opposite to Hachi but despite this, works well with him. Hachi is skittish and flighty but comes out of his shell a bit more, with Argo

Hachi in this AU also still leatherworks, some bondage but mostly various useful items and owns pet toads. He'd die for those toads