Emiya Shirou woke up to a world he thought he had left behind. He was back in the hospital bed where Emiya Kiritsugu had saved him all those years ago. But something was different this time. He could feel it in his bones. He sat up slowly, looking around the room. It was the same as he remembered it, but he wasn't the same. He had all the knowledge of the future, including the fifth Holy Grail War and his time at the Clock Tower as a mage.
Confused and disoriented, he tried to make sense of his situation. He had been studying at the Clock Tower as a mage, but now he was back in his childhood home. How was this possible? As he pondered, he heard a ding sound and turned to find the source of the noise.
To his surprise, a digital game screen had appeared in front of him with the words written on it:
[GAMER, DO YOU WISH TO START THE GAME: (Y/N)]
Shirou was perplexed. He had never seen anything like this before. But something inside him told him to press "Y". As he did, he felt a strange sensation as if something had awakened inside him.
Suddenly, he was bombarded with information. It was as if he had access to a vast library of knowledge. He understood what the Gamer system was and how it worked. It was a system that granted him special abilities and allowed him to level up by completing quests and defeating enemies.
Shirou was overwhelmed by the possibilities that lay before him. He had been given a second chance to save people and fight for justice. He would use his knowledge of the future to change the course of events and prevent the tragedies that he knew were coming.
But he had to be careful. He couldn't let anyone know about his abilities or his knowledge of the future. He had to keep a low profile and act as he always had. He was just a normal boy living with his adoptive father, Emiya Kiritsugu.
Shirou smiled to himself. He was ready for whatever lay ahead. He was a Gamer now, and nothing could stop him.