Keiko begins to suspect that her husband Shinichi is having an affair, but she never expects that the affair partner is her sister Shiho. When questioning her friend Yuka, the two quarrel and break up.Keiko was heartbroken because she lost an important friend, and next to her, Shiho, who had stolen Shinichi, smiled secretly...“Sister, you are always more unfortunate than me.”

Wanting to see her sister's unfortunate face again... When Shiho's twisted feelings intensified, Keiko's unexpected luck came to her.Pregnant with Shinichi's child.Unable to restrain her joy, Keiko was the first to report to Shiho.“Actually...I have a child.” Keiko put her hand on her stomach and chewed the happiness.That figure left Shiho speechless...I planned to push my sister from the peak of happiness to the bottom, but I didn't expect that I would also be pushed to the bottom...Anxious Shiho called Shinichi to the hotel and wanted to confirm his love for him, but it was over, right... Shinichi, who wanted to change his mood because of having a child, told me to break up...

Now is the happiest time.Keiko was finally satisfied... but it was only temporary. The evil hand of her sister who wanted to destroy her sister's happiness caused a tragedy...!!