A letter brought Tachibana Izumi to Veludo City, a city of Theater. She faced condition where Mankai Company, an agency her father loved so much, would be demolished by yakuza due to their huge debt. But seeing Izumi’s stubbornness, he gave chance and even extreme challenge to Izumi and Mankai.

After the remarriage of his father, Takara finds himself becoming the eldest of the four siblings. Wanting to try his best as the oldest brother, Takara ends up stumbling and tumbling with his relationship between his three younger siblings. Each chapter tells the tale of how Takara bonds with each sibling.