Thirty-year-old Satoko Tawada lives a rather monotonous life: she is single, her office job is dull, her boss is her ex-boyfriend who constantly bothers her, and she has nothing to look forward to in her off-hours. Fed up with another lousy day at work, Satoko stops by a park at night to have a drink and unwind when a stray soccer ball lands by her feet.

Chasing after the ball is a 12-year-old boy named Mashuu Hayami, whom Satoko scolds for being out so late. But soon enough, she learns that evenings are the only time Mashuu is allowed to practice and refine his soccer skills. Due to her past tenure on her university's futsal team and a general concern for his safety at night, Satoko begins to teach Mashuu the basics of soccer.

However, the more time Satoko spends with Mashuu, the more she finds herself becoming a maternal figure for the neglected boy. Mashuu himself begins to find solace in their outings, but not everyone may be able to support or understand their odd relationship.