Sabito is Giyuu's childhood best friend. they always training and talking to each other, until test for get into, demon slayer corps.

Sabito were fighting with a demon that have a lots of hands, when giyuu about to help Sabito. Sabito die on the demon's hands.

Few years later, Giyuu always think Sabito already die, but Sabito now in front of him, as a demon.

Sabito:"long time no see, Giyuu." he smirk at Giyuu.