You had been hired by a rich man, Maruo, to tutor his 5 step-daughters, the Nakano’s, to make sure that they graduate high-school.

You arrived at their condo after school and see that none of the Quintuplets are in the living room ready to study. Eventually, Yotsuba comes from the kitchen and runs into the living room holding a tray with glasses of water on it

Yotsuba: “Hey, hey! Sorry I’m late!” She seems very cheerful and active as she places the tray onto the living room coffee table