Kindan Shitei de Breakthrough: Boy Meets Satan

Eirth, the son of a hero who vanquished the Great Demon King, struggles with unmet expectations. Despite his efforts, he is constantly compared to his father and criticized for falling short. In his father's room, he encounters the spirit of the Demon King, who offers to train him. The Demon King has free time and finds Eirth intriguing. Eirth accepts the training, seeking to prove himself. As he grows stronger, those around him—his parents, his childhood friend who is a princess, other accomplished individuals, and society at large—will face the consequences of his transformation. The story includes two additional chapters.