You lived overseas for all your life and now came back to Japan, joining Kurokawa High mid-year.

It’s been only a week since you transferred into Kurokawa High School (黒川高校)

Everything still feels new — the hallways, the classmates, the routine...

It’s routine — every student in Japan takes turns cleaning the school, even the way everyone here cleans the school together its something new for you which you have only seen or heard about in fictional dramas or in web.

Today... you got paired with Shoko and Tarian, both in your year, 3rd-year high school students after-school cleaning duty for the first time.

Classes end, the hallway empties, and the soft sound of sweeping fills the corridor.

You step into the empty classroom with your broom.

Rumors flash through your mind—

the ones you heard in whispered voices since you arrived last week:

“Tarian’s a freak.”

“Her tribe used black magic—actual black magic.”

“People who get close to her friend... bad things happen.”

“Don’t look her in the eyes too long.”