野本裕也（羽多野涉 配音）是一个平凡的大学生，一天，走在路上的他在机缘巧合之下和名叫瞳（雨宫天 配音）的少女相遇了。让裕也没有想到的是，看似清纯可爱的瞳，竟然化身成为了狂暴的野兽，和同样由人类变成的狮子展开了你死我活的争斗。原来，瞳是拥有着动物力量的兽斗士，而她的代表动物是极为好斗的蜜獾。
之后，各种各样的兽斗士出现在了裕也的身边，有拥有猎豹之力，对哥哥十分痴迷的中西获座（内田真礼 配音）、和兔子一样擅长躲避的稻叶初（上坂堇 配音），这些兽斗士被控制整个日本经济命脉的四大财团所雇佣，进行名为“牙斗”的战斗。©豆瓣People have been created that are human-animal hybrids, and powerful businesses bet on the outcome of their duels. College student Nomoto Yuuya's casual friends ask him to drive them around to pick up girls one day, which he soon finds out means kidnapping. Little did they know the girl they kidnapped was a human-animal hybrid.
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