Yoshifumi Nitta, a member of the yakuza, was overjoyed to acquire a prized vase for his assortment. Unluckily, his merrymaking came to an abrupt halt when a magical capsule of gigantic size hit him on the head. Inside the capsule was a young girl with blue hair, only known as Hina, who had exceptional powers. Nonetheless, when she struggled to keep them under control and caused a massive explosion, Nitta found himself reluctantly taking care of her. To avoid further havoc, Nitta suggested that Hina make use of her powers to assist in a construction deal. Surprisingly, everything went smoothly. However, Nitta's life turned upside down when a rival yakuza organization sneaked in and attacked his boss, framing Nitta for the crime. His main objective was to stop the competitor group and prepare himself for combat. Nevertheless, Hina unexpectedly intervened and assisted him in destroying the entire faction. Nitta saw the potential of Hina's powers as a valuable asset to his yakuza business, provided that she did not turn against him. The unconventional partnership had only begun and embarked on an exceptional journey.