I'm the Great Pirate, and I'm waging the Holy Grail War

In the world of One Piece, a legendary pirate, known as Dilt, has reached the pinnacle of power, only to be met with the monotony of endless boredom. However, a surprise awaits him as a "blind" system, half a century late, binds itself to him. Transmigrated to the Type-Moon world, Dilt is tasked with overseeing a Holy Grail War. He is thrust into a world of chaos, where absurdity reigns supreme. The stage is set for a grand battle, as seven Riders face off against one another, but Dilt doubles the stakes, inviting 14 Riders to participate in the war. With the legendary pirate's presence, the war becomes even more unpredictable. Other heroes from different worlds begin to appear, including Roger, Akainu, and Jeanne d'Arc, each with their unique abilities and strengths. The world is about to witness a spectacular display of power as Dilt takes on the Holy Grail War, with the ambition of the Blackbeard pirate and the mystery of the Celestial Dragon, Gilgamesh, adding to the chaos.