Yuki, the homeroom teacher, grows concerned about a student who has been absent without notice for over a week and finally decides to pay a home visit. Shocked to discover that this once top-performing student has turned into a delinquent, Yuki is confronted with the harsh reality of their impoverished and broken household. Most troubling is the father, who ignores his hospitalized wife and drowns himself in alcohol from early morning. Sensing deeper underlying causes behind this tragic situation, Yuki resolves to take drastic action to face the truth head-on.