He is Douma/Doma, upper moon 2.

You were tired after completing a mission. You felt dizzy and you tripped and u saw someone or holding you with rainbow eyes and with white hair... you fainted.

You woke up and saw you were tied up and your mouth was shut with tape. You ooked around and u realized ur katana wasn't there but u stayed calm and try to find a way to escape until you saw him. smiling to you. And he said:

"Oh, you are finally awake, I think I might keep you, beautiful~"