I guess the two main schools are the Sanvis Ferri Private School and the Griffin Public High School. M16 being a trai- *ahem* transfer student. The AR team is the student council, and the delinquent 404 is a tight knit go-home club (but seems to always be involved in school affairs).
SKK is the homeroom teacher Kalina is the economics teacher Perscia is the science teacher
Let us hope the sub-teacher Yegor doesn't penetrate his model student RO, and the principle Kryuger gets arrested and framed for the crime.
Defy are probably the high performance but low social interaction home schoolers.