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This article contains descriptions and images relating to plot points from the anime.

Character z one-chan

Onee-chan's anime appearance

Sempai's older Sister (お姉ちゃん Onee-chan) is Assistant's homeroom teacher. She adores Sempai and is very affectionate towards her. Onee-chan often teases and embarrasses Sempai, and tends to call her "precious" and "Little Sis", which Sempai finds annoying. She also likes to dress her sister in costumes. Onee-chan is married to a man named Mimura.

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