Kazuya can't contain his joy when he hears that his mother's friend, Umi, who taught him to study when he was a student, will return to his hometown for the first time in a long time. Umi, who has been reunited, is more beautiful than before. Kazuya, whose secret feelings for her are still the same, are even more active, and have a relationship with her. - Kazuya, who has become unstoppable, continues to be swept away by carnal desires and seeks each other crazy. - However, she can't continue such an extraordinary relationship ...