The Holy Grail War was over. Twelve years later, the former young Hero of Justice was a married man. Of course, the war still wasn't over. After his homeland and the ocean... Shirou Emiya descended in the form of a mighty hero, wielding the power of a god to weave the Heavenly Garment anew. What kind of monster was he? A certain red Servant whose name is unknown called him as powerful as a demon god.
Illya: "Berserker is the strongest! What? Why are there two Sabers? And... what does that form mean? What do you mean the Knights of the Round Table have split up? What do you mean our Arthur, who swore off love, has a lover?"
Guinevere: "Then what am I?"
Lancelot: "And me?"
Who is that figure flying in the sky?! Why does he look so much like a certain red devil? Oh, it's the real thing... And what do you mean he's a faker? Can't you see the Ea in his hand?!
A certain King of Heroes who prefers not to give his name: "Hmph! The pork knuckle is in his hands. There's nothing this king can do." (He actually approved.)
That's how things stand. Shirou Emiya grips his sword. Even though he's already a thirty-year-old geezer... he still wants to become a Hero of Justice.
(Multiple heroines. The Illya route is being written, and the battle of the Round Table is coming soon.)