In the 21st century, bugs have become immune to all pesticides. To combat them, the corporations of Japan have developed a new remedy: HoiHoi-San, a robotic exterminator. She's tiny, she's cute, she's deadly. 
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(Source: Anime News Network)

The time is the near future. Cockroaches and other household pests have become immune to all forms of insecticides. In response to this crisis, a Japanese company has created small, doll-like, insect exterminating robots called Hoi Hoi-san. A competing company has also released their own version, Combat-san. Because of their adorable appearance, these little robots have become somewhat of a phenomenon and have gained many fans. Late at night, in the home of one such fan, Hoi Hoi-san and Combat-san search for insects to exterminate... but Combat-san is not above trying to exterminate Hoi Hoi-san while she's at it. 

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