All 13 episodes of the anime following the adventures of a pair of high school students who take a class that trains them to become Butei, armed mercenaries who are permitted to capture criminals. While Aria Holmes Kanzaki (voice of Rie Kugimiya) seems a natural gunslinger, her classmate Kinji Toyama (Junji Majima) is hopeless to say the least - that is, until he discovers a surprising key to success. The episodes are: 'The Girl', 'Aria the Quadra', 'First Mission', 'Butei Killer', 'Butei Charter, Article 1', 'Maiden of the Hotogi Shrine', 'Caged Bird', 'Durandal', 'Honey Trap', 'Special Training', 'Infiltration', 'Vlad' and 'Butei's Going On a Hot Spring Training Camp'.