Yuuya Nomoto was horrified to discover that the vehicle he was driving was being used to kidnap a high school girl, but he's even more shocked when the girl, Hitomi Uzaki, literally tears her kidnappers to pieces instead! Then she forces Yuuya to drive her to an arena where she bets the value of his organs on herself to win in a death match against a half-lion hybrid! Even more astonishing: Hitomi wins! That's because she's a Therianthrope, a genetically engineered fighter created specifically for the underground death matches known as Killing Bites! And now that Yuuya has been pulled into this dark underworld, he has no choice but to continue working for Hitomi. Because who's going to fight against a girl who's part honey badger?

Former freelance Soldier "Dragonhair" has retired for years. He set up a private investigation agency and now runs it with a group of martial arts experts. The group's premier investigator, Gene, an orphan who has learnt his excellent skills of swords, guns and Thai boxing from Dragonhair, keeps investigating crime cases while searching for his father. Anna, the adopted boyish girl of Dragonhair also works in the group. Dragonhair's daughter Run, migrated to Japan with her mother, has now returned to Thailand to visit her father. When all seems to be working so well, Dragon hair is threatened with a bullet shot into his home and a mysterious bomb like box which was sent to him. Everyone in the detective agent tries to find out who wants to kill Dragonhair. The old man has been worrying that he has to pay his debt for what the did 10 years ago but he never imagined his innocent child would also be affected....