Yuukai-han

A duo kidnapped Akane for ransom and due to her father's grudge. They consisted of an outdated thug and a large man. The thug seemed to also have intentions of assault, but according to the large man, he was just a sleazy amateur. The large man was not only big but also visibly muscular even through his clothes, a former soldier with an outsider's demeanor. Despite his large frame, his movements were agile and compact. Having experienced the thrill of killing during his military service, he found this peaceful country boring after being discharged.

Eventually, Minoru stormed into the warehouse where Akane was being held, and using a crowbar, which he saw potential in as a weapon, he brutally defeated them, leading to the kidnapping's failure. The incident itself was kept from going public as Akane's parents pulled some strings. Minoru had witnessed Akane's kidnapping, but his intervention seemed more about finding a training opponent for himself than rescuing her, as he had been honing his skills by fighting noisy bikers at night with a crowbar.

In the anime TV series, besides their original appearance in the first episode of the first season, they reappeared in the twelfth episode of the second season as cyborgs, an anime-original form. Their memories had been erased due to the modifications, so they did not remember Akane or the Stylish Thug Slayer (Shadow), but ironically, they kidnapped Akane again and were once again defeated by the previously defeated Stylish Thug Slayer (Shadow). During this encounter, the large man made a remark suggesting that his supposed erased memories were resurfacing.