Kanna, who married a man with a child from a previous marriage, was living a happy and harmonious life with not only her husband but also her stepson, Kota. However, she wanted a child and tried to conceive but was unsuccessful... Then, her husband decided to leave home for a long business trip, and she and Kota began living together. After a while, he started to become more and more physically affectionate, and while Kanna was confused by this, she was gradually swept away by it, as she was feeling unfulfilled by her indifferent husband...