女高中生本谷歌子（土屋太凤 饰）天真烂漫，有一次她虚报年龄和好友矢口三门（玉城蒂娜 饰）及其他姐妹参加了联谊活动。酒席上，不善言辞的冷面帅哥佐贺野功太（龟梨和也 饰）帮她解了围，事后借着酒劲儿，功太向身边的女孩表达了希望更进一步交往的想法。可当歌子把真实年龄说出来时，攻太却转热为冷，扬长而去。次日，歌子和好友遭到一名警察的盘问。令歌子她们惊讶的是，对方居然正是佐贺野功太。功太现年23岁，是音尾警察局地域课的巡查长。他刻意和未成年的歌子保持距离，并且警告女孩们要注意附近出没的变态。未过多久，歌子果然遭到变态纠缠。危机时刻，功太出手相助。似乎借着这件事，歌子开始转变对功太无情冷漠的看法，她无可救药落入了爱河之中。 本片根据三次真纪的同名漫画改编。

After four years overseas, Shozo returns to Japan to avenge his yakuza boss who was assassinated by his own treacherous top man, Kurawaki. The resulting battle leaves both men severely injured, and Shozo awakens in a mysterious medical facility to find his arm replaced with an M61 Vulcan cannon and his leg replaced with a rocket launcher. Meanwhile, Kurawaki has been fitted with mechanical augmentations of his own. Get ready for the second round.