Realist Demon Lord's Unblemished Reformation in Another World

In a dilapidated castle, Astaroth awoke as a Demon King. With his ‘wisdom from his past life,’ he would rule over his lands as a thorough ‘realist.’ “Demon King, why are you attacking the level 1 Heroes?” “Defeat them before they become stronger. That is called strategy.” “Demon King, why are you sending fake money to the enemy country?” “To bring chaos to their economy, so they will self-destruct.” “The werewolf troops have attacked. Should we use silver bullets?” “Not bullets, shoot them with cannons.”