Raizen High School is a public high school located in Tenguu City. It is within the Kantou region and is the school that Shido and other major characters attend. Having been built in the disaster area that affected Japan from the spacequake thirty years ago, the school is installed with the newest type of underground shelter that can fit all the students for whenever there is a spacequake occurring around the area. It is for these reasons that the school application rate is fairly high.
The school was unharmed when a spacequake occurred at the beginning of the series, though a part of it was blown up when a spacequake occurred after Tohka appeared for the second time as a powered Spirit. Then, the school days are cancelled for a while due to the repairing of the school.