The Hero Trained by the Worst Demon King is Unrivaled in the School of Returnees from Another World

Isekai Kikansha-tachi no Gakuen de Musou Suru Saikyou no Maou ni Kitaerareta Yuusha Saikyou no Maou ni Kitaerareta Yuusha, Isekai Kikansha-tachi no Gakuen de Musou Suru Saikyō no Maō ni Kitaerareta Yūsha, Isekai Kikansha-tachi no Gakuen de Musō Suru The Hero Trained by the Worst Demon King Is Unrivaled in the School of Returnees From Another World 最凶の魔王に鍛えられた勇者、異世界帰還者たちの学園で無双する由最凶恶魔王所锻炼的勇者，在异世界回归者们的学园里所向披靡

The Hero Trained by the Worst Demon King is Unrivaled in the School of Returnees from Another World

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Synopsis

Without possessing the unique skill blessed by the goddess, Kujou Kyouya failed to save the world. He was ridiculed as a "failed hero" at the interdimensional-level academy where returned heroes who had saved many worlds gathered. However, he became the strongest and most unique hero, having trained for 30,000 years in another world with the most evil demon king, Felice, who has destroyed 3,000 worlds! Now Kyouya's unique skill is so powerful that he cannot even be defeated by the strongest heroes!