A loud, brash 12-year-old who is part of a childhood friend group consisting of himself, Saki, Shun, Maria and Mamoru that attends Sage Academy in Kamisu 66. Satoru is a quick-witted and observant person who cares a lot about his friends despite poking fun at them. He is shown to be particularly close with Saki, as he teases and argues with her more often than the others. Like the rest of the students at the academy, he has a psychic ability called Cantus.
During summer camp, the group of five go off on a wild adventure that leads to Satoru and Saki being separated from the others and them meeting a Queerat named Squealer, who appears trustworthy at first but seems to have dangerous intentions.
