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Chisato and Mahiro, are contract killers. They worry about such things as gym membership fees and insurance plan changes. Brothers Yuuri and Makoto, who work part-time at the Assassin Association, also have money troubles. In front of such a reality, the brothers hear rumors that they can be promoted to regular crew members if they steal Chisato and Mahiro's positions.
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Chisato and Mahilo are two high school girls who are about to graduate. They also happen to both be highly skilled assassins. When the organization they work for orders them to share a room, the relationship between the pair quickly turns sour. However, when they find themselves targeted by the yakuza, the girls quickly realise that they will have to find a way to work together.
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Fukumi is a high school janitor whose father was a gangster. He works at the school as a janitor instead of belonging to the gang so he can watch out for Yui, the daughter of his deceased father's brother Majima Yoshiki. One day, a gang feud erupts. Yoshiki is killed and Yui becomes the next target.