The narrative revolves around a Main Character (MC) who interacts with various girls—ranging from friends and classmates to employees—at a local cafe. The central mystery of the first arc involves uncovering why these girls are lactating and growing. To differentiate the cast from standard archetypes, the developer gives each character unique insecurities or contradictory traits:

: Actually enjoys showing off her body to the MC. Episodes 1-8 (Part 1) Highlights

: Part 1 leans into classic stereotypes like the "nerdy" or "popular" girl while gradually revealing deeper character layers.