Kindan Shitei de Breakthrough - Yuusha no Musuko ga Maou no Deshi de Nani ga Warui
A Breakthrough Brought by Forbidden Master and Disciple / A Breakthrough Came Out by Forbidden Master and Disciple. / Breakthrough with the Forbidden Master - So What If the Hero's Son Is the Demon King's Disciple / Breakthrough With The Forbidden Master ~What's Wrong With The Hero's Son Being The Demon King's Disciple?~ / Eirth / apprenti du Roi-Démon (French) / Kindan Shitei de Breakthrough ~Boy Meets Satan~ / Kindan Shitei de Breakthrough ~Yuusha no Musuko ga Maou no Deshi de Nani ga Warui~ / Verbotene Allianz / Напролом с запретным учителем. А что если сын Героя — ученик Короля Демонов? / Прорыв с запретным мастером / 禁断師弟でブレイクスルー~ボーイ・ミーツ・サタン~ / 禁断師弟でブレイクスルー～勇者の息子が魔王の弟子で何が悪い～
Eirth, the son of the hero who defeated the Great Demon King, struggles to escape the expectations attached to his father’s legacy. No matter how hard he works or what he achieves, he feels he can never measure up to the legendary hero. His life changes when he enters the room where his father’s sword is kept and meets the ghost of the Demon King. The ghost offers to train him, and Eirth accepts, hoping to prove himself and get back at his parents and the world. His future holds the attention of his heroic parents, the princess he grew up with, the era’s geniuses, and the world itself.