Yuya, heartbroken after being dumped by his girlfriend, decides to ask his kind, dependable aunt Hitomi for advice. Hitomi, who has always Ke'ai Yuya like a younger brother, feels sorry for Yuya, who is completely depressed and moaning, and tries to comfort him somehow, but she accidentally blurts out, "Maybe you were just bad at sex," in her naturally straightforward manner. This comment marks the beginning of a major change in their relationship...