Maya and Yuu are a well-matched couple that everyone around them envy. The two recently moved in together and developed a deep love. One day, Yuu's younger sister Kokoa came to Tokyo from her parents' house. Maya can't hide how happy she is to meet Yuu's little sister for the first time. However, Kokoa had a certain will. "You want to steal someone's things." Kokoa steadily prepares to sleep with her sister's lover, Maya. And then the day of execution comes...
