Manabu, who had been in love with his friend's mother, Yurine, since he was a child, finally confesses his feelings to her... But he is rejected and in despair, he decides to lose his virginity at a married woman soapland! He goes to a store and finds that the No. 1 girl who shows up is none other than Yurine... Manabu begs her without any regard for appearances, and Yurine is forced to entertain him. Enthralled in both body and Kokoro by the exquisite first-time sex, Manabu becomes a regular customer, not only visiting her every day, but also secretly continuing their relationship at home...