While most of the students at True Cross Academy head home for the summer break, Rin and his classmates are sent to a training camp in the forest district, and the right to go on a real mission is riding on their performance! Locating and recovering their objectives in the woods is tough and will require teamwork, skill and lots of magic—and Rin will have to learn to rely on his friends. But is Mephisto masterminding something behind the scenes...?

Reads from right to left. Translation of: Ao no ekusoshisuto. 4.