Humans in Type-Moon, Path of the Heroic Spirit

Kamiya Yu traveled to the Type-Moon world and awakened a Heroic Spirit class card.
It allows Kamiya Yu to travel to different eras. As long as he completes the corresponding great deeds and legends, they will be recorded on the class card and uploaded to the quantum recording tape, transformed into "his own" power.
Thus, Kamiya Yu began his journey as a heroic spirit, and his first stop was the Land of Shadows outside the world.
……
1994 years.
After graduating from the Land of Shadows, Yu Kamiya was chosen by the Holy Grail and became an ordinary Master.
He had originally planned to summon Caster to join the battle, but it turned out to be his own senior brother Cu Chulainn who was suspected to be Odin's substitute?
Moreover, the purpose of this "senior brother" of his joining the battle this time seemed to be not simple...
Cu Chulainn: "Little brother, go and get rid of King Arthur!"
Kamiya Yu: "Ah... I'm fighting King Arthur?! Is that true?!"

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