Marina married a man with a child and began a new life as a family of three. Her stepson, Satoru, had never known a mother's love and kept his distance, but Marina's maternal warmth gradually caused him to open up. However, one day, Satoru, unaware of the boundaries between parent and child, asks Marina for a kiss. As he clumsily and forcefully devours her lips, Marina's maternal instincts are stirred to a fever pitch. Gently guiding the reckless and passionate Satoru, she whispers, "Let your stepmom teach you how to kiss like an adult..."
