月虹の教室, The Classroom of the Moonbow

Shinmu Minowa, an ordinary office worker, is confronted one day by Maiya Kurofuji, a former classmate from elementary school once nicknamed the “Black Witch.” She reveals a shocking truth: All of their classmates are already dead. And soon, they too will follow. Through Maiya’s magic, Shinmu’s soul is thrust back into the past. Together with classmates who have also been transported through time, he begins the desperate struggle to escape their predestined deaths! From a powerhouse creative duo comes the start of a thrilling time-slip mystery!