6-gatsu no Love Letter

A 15-year-old high school student named Momoko frequently forgets things unintentionally. Her best friend Mahiru has been a source of encouragement for her. Momoko has recently become concerned about a classmate named Ikarashi-kun, who is consistently late and follows his own schedule. One day, Kujou-kun, who is often seen with Ikarashi-kun, approaches Momoko and asks her to help look after Ikarashi-kun for a week. This involves waking him up and ensuring he gets to school on time, as he lives alone.