Crayes, who received the mysterious gift [Holy Grail] with no apparent use, was expelled from the Winsland Duke's family as a useless person. While he was feeling down, he was saved by Hinoka, whom he met in the village. Together with his childhood friend Hinoka, they eventually became adventurers, gathered companions, and became the S-rank party [Einherjar]. Crayes, who wanted to fulfill a promise from his childhood and confess to Hinoka, was shocked when she rejected him. During a quest in the forest, Crayes and his party were almost killed by their party members. [Hero] Rondo told Crayes that Hinoka was dating him, and as an obstacle, he left Crayes to be eaten by monsters, leaving him in despair. Expelled from his home, betrayed by his childhood friend, and almost killed by his companions, Crayes, for the first time, desired 'power,' and the [Holy Grail] awakened this ability! -- Vowing never to trust anyone again, Crayes decided to take revenge. 'Maybe I can do everything alone?' He was told he had a mission to defeat the Demon King, was asked for help by the Elven Kingdom, and got involved in various incidents, but he didn't care. He just wanted to take revenge on those who betrayed him! As Crayes' overwhelming power became apparent, people around him began to whisper, 'Maybe he can do everything alone.'