Outrageous action following schoolgirl Ami (Minase Yashiro) as she seeks revenge on the Japanese mafia. Ami's life is changed forever when her younger brother, who owes money to the son of a Yakuza boss, is killed. The gang then cut off Ami's arm to remind her not to mess with them. However, Ami is determined to avenge her brother's death. She recovers from her injury with the help of a mechanic who builds her a new arm - a machine gun! Intent on destruction, Ami goes in search of the members of the Yakuza clan.