Awakening on the 10th floor of a deserted hospital, university student Akashi Asanagi is thrust into a world of mystery and danger. As he navigates the eerie halls, he encounters the fearsome blue creature, Aooni, and a enigmatic woman known as the Slit Mouth Woman. Their unexpected clash draws Akashi deeper into an intricate web of alternate realities, each floor revealing more horrifying secrets. Explore diverse realms like schools and graveyards, utilizing a range of items to unravel the hospital's dark narrative. With multiple endings influenced by your choices and immersive voice-acted scenes, every decision matters. Can Akashi untangle the fate of the Slit Mouth Woman and Aooni? **Main Characters** - **Akashi Asanagi:** A cheerful first-year student with quick reflexes lost in the hospital's depths. - **Ray Yuyami:** A highly intelligent fifth-grader drawn to the occult, seeking her missing sister. - **Nissyoku Mumu:** A carefree girl and Akashi's younger sister, determined to follow him into the unknown. Conquer all 10 floors to uncover the truth and escape!