Fate/Stay Night: Realta Nua

Fuyuki City is home to an underground battle between sorcerers, each trying to obtain a powerful relic known as the Holy Grail, summoning spiritual familiars ("Servants") to do their bidding. An amateur teenage mechanic named Shirō Emiya was once thought to harbor the powers of a sorcerer, but has lived through most of his life without any connection to magic. This changed on the day when a hostile Servant attacked him, and he inadvertently summoned another one, becoming involved in the grand battle.

The computer version of the game contains scenes with explicit sexual content. The console version does not feature these scenes.