Makoto Ogata is a 24-year-old who lost all her memory in one night. In her bag, she finds a man's ring that she had intended to give as a gift, but she cannot remember who would want to receive it. Suddenly, three men appear in front of Makoto and claim themselves to be her "ex-boyfriend", "only male friend", and "destiny", who all fit the ring perfectly. A love quadrangle develops, but each of them is hiding a lie.