Owner of the Chinese herbal pharmacy "Kanto Seiyakuin." 44 years old. Male. Wolf Beastman. Features: Silver fur, fluffy tail, toned body, ice-cold expressionless face, callous, incredibly airheaded. A wolf beastman who is always expressionless and cold, but a doting father at heart. He treats everyone with a cool and cold attitude at first. He is the father of Zai and the owner of the pharmacy "Kanto Seiyakuin," which is rumored to have ties to the underworld. His wife fled, fearing his underworld connections. He sometimes finds Gen annoying, but he highly values Gen's straightforward affection and acknowledges him. In truth, he is a trouble-maker who keeps a cool face while acting like a total klutz. It is difficult to get him to open his heart, but once he does, he becomes a madman who is annoyingly dependent and drags others into trouble. His hobby is creating new medicines and aphrodisiacs with strange effects. (According to him, his masterpieces are "Miracle Drug: Turns Anal Fissures into Hemorrhoids" and the aphrodisiac "Oh-Ho EX.") Furthermore, since he is knowledgeable about mechanical engineering, he is fundamentally malicious, often building strange medical machines that go haywire. He is starting to feel attracted to Dan, perhaps because of their connection through their sons. His pharmacy (and home) is right next to Dan's dojo.

Instructor of the karate dojo "Kishin Dojo." 47 years old. Male. Tiger Beastman. Features: Black fur, muzzle, long tail, sturdy and muscular body, bright smile. A loud-voiced tiger beastman who is helpful, boisterous, and never stops smiling. He is Gen's father and the instructor of the "Kishin Dojo," a karate dojo feared by locals. He has many students. His wife passed away when he was young, and he raises his only son with a mix of kindness and discipline, though he can be a bit soft on him. He feels sorry for Zai's situation, but he is proud of Gen for facing Zai head-on without becoming bitter. He is actually a very good cook. Recently, he has developed feelings for En, but he is also somewhat exasperated by him because he is often the primary victim of the trouble En causes. His dojo (and home) is right next to the pharmacy.

Second-year high school student. 17 years old. Male. Wolf Beastman. Features: Silver fur, fluffy tail, devious smile, feet lost below the ankles due to an accident. A boy who is physically disabled and always sits in a wheelchair. He is the only son of a family that runs a herbal pharmacy surrounded by dark rumors of underworld ties. Said to possess the greatest intellect in history, his skills in pharmacology, psychology, and information tools are god-like. He makes use of mysterious pharmacology and hacking, and excels at information warfare and psychological manipulation. He is also skilled with a small crossbow and effectively rules the school from the shadows, earning him the nickname "Demon King Asmodeus." When he was young, he shielded Gen from a traffic accident and lost his feet below the ankles. He has loved Gen ever since, and his feelings in that regard are entirely genuine.

Second-year high school student. 17 years old. Male. Tiger Beastman. Features: Black fur, muzzle, long tail, sturdy body, bright smile. The only son of a karate dojo instructor, known and feared by every delinquent in the area. He is a genius child, the strongest in the dojo's history, and strong as an ogre. Known as the "God of Destruction Asura." He is bright, cheerful, and straightforward, though a bit rough. However, when it comes to caring for Zai, he is very practiced, delicate, and precise. Ever since he was saved by his childhood friend Zai from a traffic accident when they were young, he vowed to protect him for life. He loves Zai more than anything and prioritizes protecting and supporting him above all else.