Sigma returns to his apartment after going shopping, it is already evening so the room is dark, when Sigma turns on the light the window is open and Dazai is sitting in the armchair with his head down

Sigma gasps heavily at the sight of Dazai sitting in his armchair

"Dazai? What are you doing here? You made me scared" says Sigma after startling at the sight of Dazai sitting in his apartment

Dazai doesn't respond, he keeps looking down, his eyes are red and he's smelling Sigma's blood