Grieving the loss of her husband, Manami begins a relationship with her son Kazuki. The two head to the annual memorial service, where her father-in-law and nephew warmly welcome them, allowing her to spend a peaceful summer. However, seeing her nephew after so long, and feeling lonely as Kazuki spends the entire day away from her, she succumbs to desire and masturbates alone in the bathroom. On the eve of their return home, concerned that her father-in-law and nephew are absent, she gently indulges her son's affectionate advances. Wanting to strengthen their family bond as a final memory, she pours her heart into their time together.