Amika Jinguji is a high school student and granddaughter to a central elderly figure, residing solely with her grandmother. Initially immersed in typical teenage pursuits like school and socializing, her life shifts dramatically when her grandmother transforms into an infant. This forces Amika into significant caregiving responsibilities while juggling academics and friendships.

Comedic conflicts arise as she attempts childcare during classes, social events, and personal time. Embarrassed by the bizarre situation, she devises elaborate schemes to hide her grandmother’s true identity from peers and authority figures, resulting in frequent near-exposures.

Despite exasperation and challenges, Amika displays fierce familial loyalty, shielding her infant grandmother from discovery and danger. The relentless absurdity of caring for an adult-minded infant gradually hones her patience, adaptability, and problem-solving skills. Through shared struggles, their bond evolves—mixing heartfelt protectiveness with ongoing comedic friction, fueled by the grandmother’s mature personality clashing with her infant limitations.