Shota's beloved stepmother, "Mom Yanagi Rumi Ko," returns after a long absence! Coming home with her husband in great health, she notices that Shota seems a bit down and worries about him. But her concern quickly fades when she realizes the real reason for his unease—his intense fascination with her large breasts. Sensing his feelings, the kind-hearted stepmother treats him gently, though she can't hide her surprise at his bold behavior. Driven by desire, Shota keeps coming up with excuses to get closer—inviting her to bathe together, then daringly confessing his wish to bury his face in her massive tits. Their interactions soon evolve into something far beyond ordinary mother-son affection.