Saikyou no Maou ni Kitaerareta Yuusha, Isekai Kikansha-tachi no Gakuen de Musou Suru Manga

Without possessing the unique skill blessed by the goddess, a boy named 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! The legend of a boy trained by the most evil demon king, begins!
Without possessing the unique skill blessed by the goddess, a boy named 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! The legend of a boy trained by the most evil demon king, begins!

Saikyou No Maou Ni Kitaerareta Yuusha, Isekai Kikansha-tachi No Gakuen De Musou Suru - Chapter 9 - Page 24 - Raw Manga 生漫画

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Chapter 10 (English) - Saikyou no Maou ni Kitaerareta Yuusha Isekai Kikanshatachi no Gakuen de Musou Suru

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Takeshi's News Center - Saikyou no Maou ni Kitaerareta Yuusha Isekai Kikansha-tachi no Gakuen de Musou suru Vol.2 Cover; on sale April 30, 2022