A beautiful mother, Megumi, lives with her son, Satoshi. Although they live happily every day, she feels lonely because she has not been able to see her husband, who is away on an overseas assignment for a long time. One day, when her son's best friend, Kazuma, who is an old friend of hers, comes to the house to watch a martial arts match, he suddenly confesses his love to her and kisses her. Megumi feels her heart pounding uncontrollably, despite her own will. After that, Kazuma presses her again, and Megumi accepts another kiss, becoming addicted to the pleasure...