Uesugi Ren and his sister Mihato ran away from home because of domestic violence. When they at last reach the city they have a hard time finding work to earn some money. They eventually enter the service of the Kuonji family, making a pledge of absolute loyalty. Thus Ren's days of being a butler to the demanding Kuonji heir begins...

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Same setting: Maji de Watashi ni Koi Shinasai!!