Although Shi Lei (voiced by Kimura Ryohei) is a human, he grew up under the care of the Celestial Clan. Humans cannot sense the existence of the Celestial Clan, but Shi Lei's powerful spiritual power has brought these two incompatible races together. In order to solve the mystery of the collapse of the ruins and to advance history, Shi Lei embarked on a journey, and accidentally pulled out the holy sword in the cracks of the stone, becoming a mentor to purify the demon. Mature and calm Mikulio (voiced by Ryota Oosaka), kind and righteous girl Alisha (voiced by Ai Kayano), cheerful and enthusiastic Luo Jie (voiced by Mikako Komatsu), mature appearance but slightly naive personality Laila (voiced by Noriko Shimoya), a loner who lacks trust in humans Edna (voiced by Misato Fukuen), along the way, Shi Lei met companions with different personalities one after another. What kind of answer will be waiting for them at the end?