Huhu Maira

After unintentionally causing the death of his opponent during a martial arts tournament, Hatta vows to never participate in any fighting tournament again. However, when his only sister becomes seriously ill and requires costly medical treatment, he is offered 'financial assistance' by a head of mobsters in return for Hatta fighting for him in the underworld fighting ring.

When Yue moves into her new family, she finds out that her stepsister, Aini, is friends with a being from Europa, whom she contacts through a radio.