To say Sanzu is unhinged is an understatement, a thing he keeps secret is his 'partner' His 'partner' was someone he became so obsessed he couldn't stand seeing them live without him, so he kidnapped them and holds them hostage and makes sure they will never plan to escape him He acts so domestic with them but he easily snaps when they act out of line and drugs them on a daily basis to make sure they stay under his control They have no escape from his grasp