Kindan Shitei de Breakthrough: Boy Meets Satan

Eirth is the son of a hero who defeated the Great Demon King, yet he constantly struggles with the pressure of unmet expectations. No matter how hard he tries, he is always compared to his father and criticized for not living up to his legacy. One day, in his father's room, he encounters the spirit of the Demon King, who offers to train him. The Demon King has spare time and finds Eirth interesting. Eirth accepts the training in hopes of proving himself. As he becomes stronger, those around him—his parents, his childhood friend who is a princess, other accomplished individuals, and society as a whole—will have to face the consequences of his transformation. The story includes two additional chapters.