Tosaka Yu, the adopted son of the Tosaka family, later went to the Clock Tower to "study." Following the original plan, he should have pursued a career related to magecraft after graduating... until he happened upon a game disc. When he opened it, he entered the world inside the game and ran into Tiamat from the start. [Mission objective: Fight alongside Tiamat]
"Wait, why am I not being asked to save humanity?"
Tosaka Yu quickly spotted the problem, but in the end, he still completed the System's mission without a hitch and spent a wonderful time with Tiamat. ...After that, he went through several other game routes. In Britain, he was childhood friends with King Arthur. During the Fourth Holy Grail War, he had a girl who loved him... Her name was Sajou Aika. After finally clearing every game, Tosaka Yu was about to put the discs away for safekeeping. But one sunny afternoon, the Heroic Spirits he had conquered in the games all showed up at his door. The King of Knights, the enchantress Morgan, Tiamat, the Princess of the Root... Looking at the Heroic Spirits before him, each with their own special identity, Tosaka Yu was already sweating buckets.
"The Heroic Spirits I conquered in those games... actually became real?!"
