You Were Supposed to Fight for the Holy Grail, but You're Raising Pigs in Einzbern

[Type-Moon + Fullmetal Alchemist + Farming + Lighthearted Power Fantasy + Overpowered Protagonist]

"To obtain something, you must give something of equal value." That was the truth Lin En learned in a world full of alchemists.

But when he opened his eyes again, he found himself transformed into a stone glowing crimson, clutched tightly in the palm of a little girl with silver hair and red eyes.

This was Fuyuki City, on the eve of the Fifth Holy Grail War.

The little girl before him was Illya, a tragic girl fated to become the Holy Grail's vessel and die.

Lin En smiled. As a genius who had created the "Philosopher's Stone," he was determined to rewrite her fate.

Not enough mana? No problem. I'll buy the pig farm next door. The souls of three thousand pigs are enough to power a single forbidden transmutation!

Body falling apart? No big deal. I'm an expert in human transmutation. I'll make sure you live to a hundred!

Who's Gilgamesh? Could he withstand one particle cannon powered by the compressed souls of fifty thousand pigs?

Watching Shirou Emiya and Rin Tohsaka stare in stunned silence, Lin En controlled the red stone as it floated in the air. "Don't get the wrong idea. We're not here to fight for the Holy Grail. We're here to teach you what 'scientific cultivation' means."