Once an 11th‑grade student named Aruma Tandodji witnessed a shipwreck. A few days later, a beautiful girl called Ruri Ayba knocked on his door. She asked for his help in fighting monsters known as the "Stones of Evil." Only by using Aruma"s power can she defeat them. However, three years ago an incident involving the boy injured 18 senior students, after which he became a pariah at his school. Nevertheless, by fate"s will he will have to fight the monsters while protecting his classmate Vakanu—the only one in school who does not avoid him.