Fate/Stray Night

Emiya Shirou fought in the Holy grail war, and had emerged victorious in more ways than one. Not only had his enemies been defeated, but he had emerged with 3 girlfriends, Saber, Rin, and Sakura. They, along with Rider, Illya and Taiga now live at the Emiya residence, as the new school year is about to start. But their peaceful days will soon come to and end, as Matou Shinji sets his eyes on all the women living at the Emiya residence.