An ordinary college student, I live a completely average daily life. The only thing that sets me apart is having a girlfriend living with me. My girlfriend, Ichika, has a great figure and is incredibly kind. Lately, though, there's been one thing bothering me—she's become obsessed with my nipples. Regardless of my own feelings, she constantly pinches and plays with them, day and night. My nipples might no longer belong to me, but to Ichika, as part of our everyday existence.