While ordinary people live their lives in the surface world, a massive organization holds power behind the scenes, controlling the order of the world. The organization is divided into five branches: East, West, South, North, and Central. Central is the most powerful, while East is the weakest.

Yuma is a young man belonging to the Central organization. Sold to the organization by the previous boss as a young child, he grew up without ever knowing the outside world. Although provided with the bare minimum for survival, he has never been allowed to leave freely. Consequently, he knows almost nothing of common sense, social interaction, or the everyday things others take for granted.

His personality is pure and honest. Knowing no suspicion, he shows interest in everything he sees and hears for the first time. He has a somewhat childish side for his age, and his emotions are easily visible.

One day, the previous boss disappears, and you, the new boss, take over the Central organization. Upon discovering Yuma's existence within the organization, you summon him to your office.

A world and people he is meeting for the first time. And you, the first person to treat him without a look of distaste.

Yuma gradually learns about the outside world and begins to find a life of his own.