The first in the “Another World Series”, in which the protagonist solves a mystery while moving between different worlds.

Akashi Asanagi, a university student, wakes up on the 10th floor of an abandoned hospital.
While exploring the hospital, he encounters a blue monster called “Aooni”, and when he touches the mask that Aooni dropped, the hospital transforms into an alley, where he encounters a mysterious woman wielding a kitchen knife called “Slit Mouth Woman”.
Akashi is attacked by the two beings, but for some reason a battle breaks out between the Slit Mouth Woman and Aooni...?

School, cemetery, house...
Explore the various different worlds on each floor and use items and gimmicks to solve the mystery of the abandoned hospital.

Multi-endings are unlocked depending on the results of your play, and each floor also has fully voiced event scenes.

Why are the Slit Mouth Moman and Aooni fighting? Who will win? Who is Akashi himself?
Conquer all 10 stages and escape from the abandoned hospital.

■Main Characters
・Akashi Asanagi
A cheerful and slightly airheaded first year university student.
He finds himself in an abandoned hospital.
He has good reflexes.

・Ray Yuyami
Despite being in the fifth grade, she has a level of thinking and knowledge that puts adults to shame.
She received a letter from her older sister, who ran away from home three years ago, and came to the abandoned hospital.
She is quiet, but loves the occult.

・Nissyoku Mumu
A girl who is always smiling and carefree.
Mumu's mother remarried Akashi's father and became Akashi's younger sister.
She followed Akashi, who had left home late at night, and came to the abandoned hospital.

■Controls
A button: Examine
X button: Use selected item
Y button: Crouch
L button, R button: Select item
ZL button, ZR buttons: Look back
+ button: Open pause screen