An Unlucky Office Worker Who Got Involved in the Holy Grail War

(In terms of setting, the protagonist has no knowledge of the Holy Grail War and the Moon due to chance. In addition, the world is not in the Moon, and the Holy Grail War has been slightly modified. For example, I am too lazy to think about the heroic spirit panel, so I just don't do it. There are original characters and anime characters, but some plug-ins are arranged for the protagonist. Mainly because if there is no plug-in, the protagonist will not have traveled through time in vain.) On this day, Li Siyu, who clearly traveled through time after death but thought he was just reincarnated, came to Camelot City due to work needs. Just when he finally found a cheap hotel to rest, a loud noise suddenly came from outside. When he saw it, there were several people in strange clothes fighting. The next moment, he felt itchy in his hand. When he lowered his head, he found a tattoo on his hand. At this moment, the other party focused on him and launched a hunt for him. When he thought he was certain to die, he fled to the rental house. A magic circle suddenly appeared on the ground, and a figure stepped out of it to save him. And asked Li Siyu if he was his master? Although his English was not very good, he still understood the sentence. Later on, it was obvious that he wanted to get rid of all this at first, but in the end he embarked on the road of saving the world? But the further he got to the back, the more confused he became. What the hell is Luchiel, and that one over there, the Kamen Rider Holy Blade? This is indeed the real Saber, what? You said I can change too. What a value for this time-traveling thing. I'm actually giving away genuine Bandai toys for free.