LORD OF LORDS RYU KNIGHT

The story is set in “Earthtear,” a mythical world filled with legends and mysteries where monsters, fairies, giants and magicians live. Adeu goes on a journey of training with a robot, Ryu, that has a will and mind to become a real knight. But their enemies have stolen up behind them with the aim of controlling “Earthtear.” (Source: Sunrise) — Description from AniList community (anilist.co).