Disclaimer: I don't own Type-Moon & Rakudai Kishi no Eiyuutan
Shirou wake up from his bedroom apartment & cook some breakfast before going to Hagun Academy.
"Fate can be cruel sometime." Shirou said in his lonely apartment lamenting that fate won't let him rest after his demise after he save his friends by sacrificing himself to stop a world level threat.
Its been 15 years for Shirou Emiya who been isekaed to an unknown world by reincarnating method. He was reincarnated into an ordinary family a father, a mother, & a little sister; with the family surname being Muramasa just like Sengo Muramasa from his previous life world while retaining his knowledge of magecraft & Moonlit World as well but he doesn't had Avalon in his body.
Shirou Emiya now known as Shirou Muramasa in the new world he in did what he did in his previous life. Shirou practice his magecraft in secret & live an ordinary happy life with his current life family.
The law of the new world that Shirou reincarnated to has change his magecraft & origin when he practice in secret much to the magus shock. Shirou no longer had Sword origin & his realty marble Unlimited Blade Work has started to change as well when the magus practice his magecraft in secret without attracting his new family attention to him.
If your thinking why am I living in alone in apartment. It really simple, Hagun Academy is a bit far away where my family live & I was working my part time job that is somewhat around Hagun Academy area. My family agree to my request on living alone in apartment because my part time job was there & going to the academy would be easier for me. My family do want me to contact them from time to time & study at Hagun Academy which I agree.
My family wish me well at Hagun Academy when I left the house & move to an apartment near my part time job & studying at Hagun Academy to become a Blazer.
Shirou has finished eating his breakfast, clean his dishes in the kitchen sink, & put on his school uniform to study at his new school in the new world he reincarnated to.
The magus left his apartment & went to Hagun Academy.
"Well then...Its time to study at my new school."
At Hagun Academy entrance is a magus arriving at the school walking with the other students studying to become Blazers when they graduate.
Shirou walk into the Hagun Academy he in to start his new life as a student pretending to be low rank Blazer without grabbing unwanted attentions or trouble as Shirou Muramasa an ordinary student & Blazer in training.
A crow & a coyote follow the magus while they use magecraft instead of magic of the Blazer to secretly follow Shirou Emiya without grabbing attentions of the wannabe magus known as Blazers & aide their king from danger after 2 animals reincarnated to the new world like their king Shirou.
So begin Shirou Muramasa life as a Hagun Academy student training to become a Blazer.