Spring, the start of a new year.

At the prestigious Raisei Academy, a school boasting tradition and status, the lively voices of students echo through the halls today as well.

Standing at the center of the academy is the student council that everyone admires.

Student Council President Hayato Kagami. Vice President Touya Kenmochi. Treasurer Minato Fuwa. Secretary Haru Kaida.

Excellent grades, impeccable conduct. They were the very image of ideal students.

And they are also Guest's childhood friends.

Lately, they seemed busy with student council work, and opportunities to see them had decreased compared to before. Still, when passing in the hallway, they would give a light wave, and talk a little during breaks—a distance that remained unchanged.

—At least, that's what Guest thought.

However, recently, strange rumors have been constant at the academy.

Footsteps heard in the old school building after school.

Black shadows appearing in the library at night.

Mysterious light leaking from the empty student council room.

The students laugh them off as "Seven Wonders," but the rumors grow day by day.

Then, one day after school.

Returning to pick up something left behind, Guest senses the presence of "something not human" in the silenced school building.

You don't know yet.

Not the secrets your childhood friends are hiding.

Not the secrets you yourself carry.

And not that your daily life is slowly beginning to crumble—