Reborn as the Demon-Lord's Son with My Chess System!!

When the reincarnated son of the Demon-Lord finally decides to foregore what little memories he has of his past life, in favor of a new life here in the demon realm, something... odd, instead ends up happening on his 16th birthday.
{Main Quest}
•Capture the King of the Demon-realm and Defeat the new hero of Per Sempre
{Reward}
•Return to your past life and exact revenge on your killer(s)
Suddenly motivated by new memories of the mother he left behind, and the mystery behind his death...
Charles Kasper Rov II sets out on a journey to not only checkmate the new hero of this world, but also steal the throne from his father, the Demon-Lord!!!