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Kaito Takahashi is an ordinary high school student with ordinary dreams. That all changes when he stumbles upon a mysterious wristwatch-one that shouldn't exist, and definitely shouldn't work in human hands.

But the watch was never meant to be used by anyone.

An accident occurs. His childhood best friend, Karasu Fujiwara, is caught in the activation-and transformed into something beyond human. Something that doesn't fit the rules of the world they thought they knew.

Now, with the watch on Kaito's wrist and Karasu bound to it by fate, the two of them are dragged into a hidden conflict between beings not of this Earth. Beings known as Servants-bio-engineered weapons with minds of their own, fleeing from invaders who want to reclaim them at any cost.

Kaito wants to go back to his normal life. Karasu just wants to be left alone.

But when you're holding the leash of a weapon that was never meant to exist on Earth, there's no such thing as walking away.

(A/N: Okay, to clarify a few things, I will not hide that even though this is technically like its own separate thing and definitely gonna try and be original, I will not lie that there are some parts of it that is heavily inspired by other series, I just wanna try something unique, okay, but I still hope you still enjoy it. Also feel free to comment a lot in the comment section because I love and actually like seeing a lively comment section. Plus I also want to hear your thoughts and opinion about it as well.)