A young runaway named Asuta Jimon has a chance encounter with a young girl while wandering the streets at night. Little does he know this cute little girl, Hoshimiya Kate, is really the leader of Zvezda, an organization bent on world conquest. Taking her talk of world conquest as a simple flight of fancy Asuta walks with her and plays along to an extent. He soon realizes the import of her words when he is confronted with a swarm of dangers and strange happenings.

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Asuta having wondered the streets all night sleeps through school. After the bell, he is greeted by Itsuka, a member of Zvezda, who was sent to bring him back to Zvezda's secret headquarters, coerced with the promise of food he follows her. Asuta is dismayed by the horrible quality of the food Itsuka herself prepared, as were the Zvezda members, most of which ran out on the meal. There is an introduction to another secret society in this episode, White Light. To make things worse, Zvezda's giant biological weapon is deployed prematurely, forcing the members of Zvezda to subdue it. That said and done with a fight breaks out about Itsuka's questionable cooking ability, after which it is resolved that Asuta should do the cooking and also teach Itsuka how to cook.

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After booting Yasu out of the hideout for smoking, the group go out for a meal, only to have their experience ruined by more smokers. Having had enough, Kate declares war on smokers, soon rallying the city's residents to drive them out of town. This ends up pushing the remaining smokers to their most desperate, resulting in a chaos that neither Zvezda nor White Light can vanquish.

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When the Zvezda hideout's energy source, generated from the Udo that grows underneath the base, Kate, Asuta, Natasha, and Roboko go underground to investigate what is causing the Udo to die out.

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As Kate tasks the others with figuring out the secret identity of White Light's captain, White Robin, Asuta suspects that it may be his classmate, Renge Komadori.

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Kate and Roboko enrol into Asuta's class and, together with Asuta and Renge, they investigate a mysterious After School Treasure Club and infiltrate it.

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The Treasure Club turns out to be a trap laid out by White Light's White Egret, aka Miki Shirasagi, whilst Asuta and Kate come across a more incredible and dangerous treasure.

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White Light's commander, White Falcon, aka Kaori Hayabusa, hatches a plan to trick Kate into bringing her into her hideout.

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Both Zvezda and White Light coincidentally have company vacations at a masked hot spring inn, where Asuta (as Dva) and Renge (as White Robin) get to know each other. Objecting to this, Miki launches her attack, during which Renge stands to protect Dva, learning of his identity as Asuta.

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West Udogawa is in a state of emergency as White Light declares war on Zvezda and destroys their base, having Kate and the others on the run.

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With the city taken over by White Light and many of the Zvezda members captured, Asuta contemplates what he should do.

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The members of Zvezda gather for the final battle against Asuta's father, the Governor of Tokyo, to make their very first step to world domination.

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