Star Driver.

One night, a boy named Takuto washes up on shore swimming from the mainland. He later enrolls in Southern Cross High School as a freshman and makes new friends. However, beneath the school is a group of mysterious giants called Cybodies, which can be controlled by humans in an alternate dimension known as Zero Time. Takuto, The "Galactic Pretty Boy", finds himself dragged into opposition with the "Glittering Crux Brigade".