Momoko is an absentminded first-year high school student who makes a lot of careless mistakes. She is able to keep pushing on thanks to her best friend Mahiru's support. Lately, she has been interested in a classmate, Igarashi-kun, who is always late to school! One day, Kujou-kun, the person who is always with Igarashi-kun, calls out to her. He asked her to wake Igarashi-kun, who lives alone, up each morning and take him to school for a whole week...!? (Source: MU)