The Salted Fish Demon King Has No Daily Routine

What is a professional fisherman? (Tactical fallback) You have seen a demon king who can do whatever he wants with his powerful magic power. Then have you seen a demon king who can summon one hundred and eighty battleship main guns with a snap of his fingers? You have seen the giant demon king who destroys the world, but have you ever seen the demon king who is proficient in mechanical computers? What is the daily life of the Demon King like after retirement? The answer is: no routine! (The new book "Scientists Can Do Whatever They Want" has been released! Looking for quality!)