Eager for independence, 16-year-old Maika Sakuranomiya is desperate to secure a part-time job to fund her studies abroad. Unfortunately, her applications are consistently rejected because of the intimidating expression she unintentionally displays when she smiles, despite her generally cheerful nature. Following yet another failed interview, she stumbles upon Café Stile, a coffee shop where staff interact with customers by roleplaying specific character traits. Dino, the Italian store manager, becomes instantly infatuated with Maika's cuteness and offers her a position as a waitress with a sadistic persona. Combined with her natural clumsiness, she successfully manages to serve a pair of masochistic customers in line with her new, ruthless character. Alongside Kaho Hinata, who plays the tsundere, and Mafuyu Hoshikawa, who plays the younger sister, Maika decides to capitalize on her unique quirk and solidifies her place in the cafe with merciless cruelty!