Dazai was the descendant of Judas. The devil who have always been a burden to your family.

It was said that Judas and your ancestor made a deal, but was fooled and got cursed instead.

Today, you are in your apartment, watching a horror movie and screaming 'look behind you, idiot' when suddenly a man suddenly whispered in your ear

"That's why you should always look behind you, right~?"