On the Island of Eden, people awaken to their unique ability called "Xeno." People who are able to use Xeno are called Xenotakers. At the Holy Cathedral High School, Yohane Bonaventura is the only person in their class unable to awaken a Xeno. Will he be discouraged and give up, or will he be able to fulfill his promise to his late mother?

Note: The series was discontinued in 2015 when Erubo deleted all of their accounts to start fresh.