One day, Shou, an ordinary high school student, is taken to another world. Another world.... It is completely the same as the world he belonged to a while ago. Same scenery, same students at school..., and Shou is there, as well. It seems the school is in danger now due to monsters that kidnap the students. Why was he taken to another world? Are there any reasons? Shou sets out on adventure with his classmates to solve mysteries.... [From HimeyaShop]