During her school days, at a hot spring training camp for her club, her senpai mocked her for having overly long nipples, leaving her so embarrassed that she stopped attending club activities and eventually quit. Later, during her first sexual experience with her boyfriend, she couldn't bring herself to let him see her nipples. After that, she became hyper-aware of her nipples and started touching them daily, masturbating frequently. When she played with her nipples, they would swell and elongate, giving her intense pleasure she couldn't resist. Losing confidence in her body, Maho Kitagawa finally decided to appear in a video. When her nipples and clitoris were stimulated at the same time for the first time, she writhed in ecstasy and climaxed uncontrollably. She realized how foolish she'd been not to experience such pleasure until now.