A young upper-class elite man, Ichinomiya "Riku" Kou, who has a policy of not ever wanting to be in debt to anyone, ends up owing his life to a strange girl, who rescues him. His saviour is Nino, a beautiful homeless girl, who believes that she is from the planet Venus and lives under the bridge by the Arakawa river. So the young man ends up living there too.
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