A young man that was transported together with his classmate to the another world called "ancient planet Astral". As he was separated , he was shocked that when he woke up inside the abandoned empty castle alone, he hears a voice. This fateful encounter is shocking and what more unexpectedly is he was the biological son of demon lord Alpha known as the wisest demon king of all time, what will be the fate of the young man who was born through the forbidden love between Demon lord Alpha and Hero Alice?! Will he bring back hope to all mankind or world domination!?!