Aka no Sekai
This volume is a collection of stories. In the story of "Aka but Seki", there is a summer camp for children in rural areas. The main character, Regulus, reluctantly visits the summer camp, where he divides the room with a cheerful guy named Miran. However, soon after their arrival, some other children begin to behave strange, arguing that they want to see a red color. Will Regulus and Miro find out what happens until it was too late?