Fate/Prototype: Sougin no Fragments

A prequel to Fate/Prototype, this story is set in Tokyo in 1991. Seven mages participate in a ritual to summon seven historical, mythical, and legendary heroes for battle, with the Holy Grail as the prize. The Grail is said to offer limitless power and the ability to grant any wish. One of the mages is Manaka Sajou, a young woman under great pressure. When she summons her Servant, she is surprised to see a fairy tale prince instead of the warrior she expected.