Masaru, a young man burdened with inner turmoil, lives with his beautiful yet strict mother, Kana, who has always supported him. Despite their close bond, he secretly harbors romantic feelings for her, tormented by the painful reality that a romantic relationship between parent and child is impossible. Unable to focus on his studies, he struggles through each day. Seeing her son's distress, Kana comforts him with pure, innocent affection, offering warmth and kindness. Though Masaru tries to suppress his emotions, they gradually spiral beyond control. He finds temporary relief only through masturbation, but as the crucial college entrance exams approach, his performance falters and he ultimately fails. Witnessing his deep despair, Kana draws closer to him, seeking to understand his heart and comfort his wounded soul.