Labyrinth of Chains

"The contract will soon be made. And when it does, our souls will become one, and promise me to never ever leave my side until our destinies end. Promise?"

"Yeah, until our destinies end..."

The contract has been made. It can never be broken, and it must not be broken.

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When he woke up with no memory of his past, Kai was saved by a witch named Runa, who took him in and asked him to become her apprentice. But all that soon came to an end when they were being attacked by a mage assassin which caused Runa to released all her "unknown" powers.

Kai now discovered the truth that Runa was never a witch, but she was the incarnation of a demon queen named Astoria Lucial Heartblade. But because Kai witnessed a demon, he is forced to form a contract with her and serve as a "guardian".

The two then started a journey to find the "Seven Demon Amulets", to defeat an evil demon lord who took over Runa's territory in the demon world. But in order to do so, they must travel and defeat monsters who guard each of the amulet in each different places.

Will the two overcome all tasks and defeat the evil demon lord?