"Gakuen Shimai" is a short anime series that revolves around the daily lives of two sisters, Miu and Aoi Takashiro, who live together in a school dormitory after their parents move abroad. Miu, the younger sister, is cheerful, energetic, and often impulsive, while Aoi, the older sister, is more reserved, responsible, and mature. The series explores their interactions with each other and their classmates, highlighting the ups and downs of sibling relationships and school life.

The narrative is episodic, with each episode focusing on small, slice-of-life moments that capture the sisters' bond and their experiences at school. Miu frequently gets into playful mischief or finds herself in humorous situations, often requiring Aoi to step in and help her out. Despite their differences, the sisters share a deep affection for one another, and their dynamic is central to the story. The series also introduces other characters, such as their classmates and teachers, who add variety to the interactions and contribute to the lighthearted tone of the show.

Themes of family, friendship, and growing up are woven into the narrative, with a focus on the simple joys and challenges of everyday life. The series avoids heavy drama or complex plotlines, instead opting for a gentle, heartwarming approach that emphasizes the importance of relationships and the small moments that define them. The interactions between Miu and Aoi are particularly endearing, as they navigate their differences and learn to appreciate each other's strengths and quirks.

Overall, "Gakuen Shimai" is a charming and straightforward series that offers a wholesome look at sibling relationships and school life, appealing to viewers who enjoy light, character-driven stories.