"I'm back, Mom." Kazuya returns to his hometown where his mother Yuka lives for the first time in a year. Yuka is Kokoro to be reunited with her beloved son whom she raised with care. A year ago, the two of them made love every day. Yuka can no longer contain her excitement at Kazuya, who has now entered the workforce and grown into a strong man. They seek each other passionately to fill the gap of the year, but it's not enough. Her moans turn into screams as he thrusts into her, seemingly forever.