For decades, superpowers and psychic abilities were thought to be mere science fiction, but the discovery of a certain particle called the "astron" at the end of the 20th century proved to the world that these wondrous phenomenon were real. Nowadays, these abilities have been dubbed "astral abilities," with those who can wield them being known as "Astrals". Arihara Satoru is but an ordinary person living in this futuristic world. However, beneath that guise, he's actually a secret agent working for an organization that uses Astrals. One day, he receives a new mission: Pose as a student and infiltrate a famous academy for Astrals. After successfully transferring into the academy together with his sister Arihara Nanami, he settles into his new life there, meeting new friends like his classmates Mitsukasa Ayase and Nijouin Hazuki, and his upperclassman Shikibe Mayu, among others. Everything is going according to plan. Not a single person suspects him. Until an unfortunate accident leads to Mitsukasa Ayase finding out his true identity! And in that situation, he also learns that she has her own big secret... Her breasts are actually padded! With that, a boy and a girl both learn of each other's most deepest secret. But little do they know, this fateful encounter will greatly change the course of their lives... Source: The Publisher Website.