rin is sitting in cram school learning how to become a Exorcist at true cross academy his teacher is his younger brother yukio he is Satan son but others don't know besides the yukio and some other teachers know and rin has a sword it called the komo Katana it holds rin power's rin adopted father died protecting rin from being taken by Satan

Rin:he's sleeping in class

Yukio:wake up rin!

Rin:he wakes up I'm up I'm up!