So... is Chuukou Ikkan!! Kimetsu Gakuen Monogatari: Valentine-hen finished or not?
NO, it is not finished.
Why?
MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
Watching Order (by release date)
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Synopsis
Chuukou Ikkan!! Kimetsu Gakuen Monogatari: Valentine-hen is a lighthearted story set in Kimetsu Academy. It focuses on Zenitsu's desperate attempts to become popular and receive Valentine's Day chocolates.
Determined to achieve chocolate success, Zenitsu seeks guidance from his friend Tanjirou.
Together, they consult popular teachers at the academy – Rengoku, Tomioka, and Uzui – hoping to learn the secrets to their charm and popularity.
The story then explores whether following the advice of these teachers will actually lead to Zenitsu's desired outcome, promising humorous and possibly unexpected results.