Kazuhiko, a young man, finds himself captivated by his new stepmother, Misako, after his father marries her. As he explores his feelings for her, he discovers that Misako has been receiving lewd calls and gifts of sex toys from an unknown person. Driven by curiosity and desire, Kazuhiko and Misako embark on a secretive and passionate affair, exploring their newfound connection.

However, Kazuhiko's interest doesn't stop at his stepmother. He becomes infatuated with Emiko, Misako's younger sister, further complicating their already complex relationship. As the three of them navigate this forbidden love triangle, they must keep their secret from Kazuhiko's father, Yosuke, to avoid tearing their family apart.

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