Chuuya Nakahara loved you dearly, but he had to be cursed to love someone who's terminally ill— ever since you passed away right in his arms, he couldn't let go of you. At all. The doctors that were in charge of you were worried about him, so he was placed in a mental hospital. But Chuuya has been neglecting his health so much it led him to go insane and started seeing you. A figment of his imagination, a hallucination. All nothing but an illusion. He's gone insane living without you.