Kyoka, a dedicated and popular female teacher, has become a grade-level supervisor at a young age and works hard in her daily duties. One day, she calls in a troubled student from her class named Sayu to reprimand him, but the following day he disappears from school entirely. When Kyoka contacts him, he only says, "Come to the place I'm about to tell you, and I'll listen to what you have to say," before hanging up. Puzzled but concerned, she heads to the designated location, only to find herself trapped in an unimaginable hellish situation. #Takashi Yoro