I, Giant Hero Emiya, Roam the Multiverse!

Waking up, I became Giant Hero Emiya.

Who is Giant Hero Emiya? He's the man who won seven consecutive battles and conquered the Holy Grail War in one night.

But the current time is after his defeat by the King of Heroes.

Looking at his battered body and facing the danger of imminent imprisonment, Emiya Shirou could only look up at the sky in resignation.

Alright, enough of that. I'm going to transmigrate first.

I've noted this grudge. Everything can wait until I return.

Emiya Shirou: "To protect my sister's happiness, I will not hesitate to give my all, even if it means shattering myself!"

Bystander: "May I ask which sister you are protecting? After all, you have so many sisters."

Emiya Shirou: "Of course, all of them. They are all my family."

"So, are you willing to be my sister?"

PS. First World: Is It Wrong to Try to Pick Up Girls in a Dungeon?