This fragment most commonly serves as a trope or a search tag, often used to describe specific genres and themes in media. It's frequently associated with Japanese visual novels , anime, or video games that are set in a high school environment. A perfect example is the game "Danganronpa V3: Killing Harmony," a title famous for its high-concept plot where "16 new characters find themselves kidnapped and locked in a school" . This exact combination is a very common thematic keyword for that genre.
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