A third person shooter where the main aim is to complete levels by defeating hordes of various kinds of insects, all while avoiding collateral damage to furniture and other household items. Money is earned depending on how fast you complete a mission (less any damages). Money can be used in the shop to purchase weapons, clothing, and parts for HoiHoi-san. As the story goes
in the year 20XX, insects have become immune to all insecticides. To combat the rising plague of cockroaches and other household pests, tiny, doll-like extermination androids were created. They hunt down insects and kill them with miniaturized weapons such as swords, maces, machine guns, and missile launchers. At the same time, they can be treated as dolls by dressing them up in costumes and buying accessories for them.