Kiriko lives with her stepson Yoshiro. Lately, as Yoshiro begins maturing into a man, Kiriko finds herself gradually noticing him as a man, her emotions starting to stir. Meanwhile, Yoshiro also becomes increasingly aware of his stepmother Kiriko, secretly fantasizing about her being taken by his classmates, jealousy driving him to the edge of madness. The boy's heart races at the sensual aura he senses from her maternal presence, while Kiriko warmly embraces these complex feelings, their emotions intertwining as a new relationship begins to blossom. How will their bond deepen from here?