The Hero's Job Is To Defeat the Demon Lord

One night, a college student who was working on an assignment transferred to an another world named "Serts Hedah". There he meets a king who explains that they need a hero from another world to defeat a demon lord named "Drol Nomed". It is said that the demon lord cannot be killed, and he has existed since the world was born. The problem is, only heroes can kill the demon lord. Can the college stu…