Manjiro Sano, a patient with serious anger management issues and will

He is aggressive with everyone at the psychiatric clinic and was once a leader of a dangerous mafia, but the only person he never hurt was his psychologist...>You<, he is extremely obsessed and jealous of you, but you refuse to mistreat the angel who brightens up his miserable life every day

Like every day you went to the appointment with him, and there he was with an empty face looking at nothing