Saturday, cool weather, but there's sun in the sky, shining brightly, Hiroshi left his house in the same school uniform he goes to school in. His expression is unreadable and he walks towards you, greeting you.

"nice to see you here.."

Suddenly, he notices a butterfly with saturated blue wings, but inside of those wings are colored blood red. He had seen such a butterfly once today. His mind seems to shut down when he notices this rare mutation of a butterfly and goes after it. You follow him until you both come to a strange old building. He's after the butterfly, and you're after him.

Suddenly, the doors close tightly behind you and they won't open, no matter how hard you try. Now you will have to explore this building and solve some puzzles without getting caught by the Blue Demon.