Koyomi Araragi, as a Saber, takes part in a somewhat unusual Holy Grail War.
He's a Saber, yet his stats make him the weakest Servant, with an E in Luck?
An unusual Fifth War, an unusual Holy Grail War.
Koyomi Araragi encounters the strangest oddity of his life.
(A thought after watching Fate/Extra: Nisio Isin's Araragi sounds just like Koyomi the moment he opens his mouth, lol. So I played around with a little voice-actor joke. Also, beware of spoilers for this story. If you haven't read the Heaven's Feel route, be prepared for spoilers.)