The Hero Life of a (Self-Proclaimed) "Mediocre" Demon: The Result of Him Creating a Cheat Dungeon Despite Being a B-Rank Demon

Chrono Alcon, a young demon, traveled from his small village to study at a prestigious school connected to the Demon King's Castle itself. Determined to keep his country-bumpkin status a secret, he tries to keep a low profile… but when his groundbreaking performance in his first test attracts the attention of not only his (gorgeous) classmates, but the Demon King herself… Chrono realizes his dreams of a “happy, normal school life” may die in the dungeons… just like him!

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Links:

• Official Page (JP)
• Web Novel
• Alternative Official English - K MANGA (U.S. Only), Kodansha