Sayaka was born into an ordinary family—neither wealthy nor poor. However, her youthful, lolita-like appearance has always been a source of frustration. Meanwhile, Akari grew up in a household with working parents, and developed an early curiosity, secretly reading her father's porn magazines and borrowing her mother's vibrator for masturbation. Akari, pretending to be older, started working part-time at a cabaret club, but after drinking too much, she failed her classes and was forced to repeat the year. Surrounded by younger classmates, she struggled to fit in—until she met Sayaka, the only one who showed her kindness.