Focusing on Tokiomi’s daughter Rin, the story tells how Rin was involved in the Fuyuki City Kidnappings. Rin is determine to follow in her father’s footsteps as a great mage by learning the art of Crystal Magic. With the Holy Grail War starting soon, Tokiomi tell his wife Aoi and Rin that they have to leave Fuyuki City for their own safety. Rin wants to help her father but accidentally opens a dangerous grimoire until her father saves her. Tokiomi gives Rin a magical compass that detects Mana and warns her that if the compass reacts violently, it means a powerful mage is nearby and she must avoid them. However, in her school, several students including her best friend Kotone have been kidnapped by the infamous Fuyuki City Killer. Wishing to save Kotone, Rin head to Fuyuki City alone to find the culprit using her Mana Compass. Eventually, Rin finds the culprit, Uryū, using a magical bracelet made by Caster, to hypnotize the children to follow him to his hideout. Arriving at his hideout, Rin finds Kotone and several children hypnotized but is found by Uryū. To free the children, Rin destroys Uryū’s bracelet by overloading it with Mana, blinding him and freeing the children from his control and escapes. With Kotone and children picked up by the police, Rin heads home only to detect and confronted by one of Caster’s monsters but is saved by Kariya. Aoi searches for Rin in Fuyuki City and finds her in a park guarded by Kariya who tells her he will win the Grail to bring back Sakura to her. An Assassin monitors their encounter with Kirei ordering Assassin to continue monitoring Kariya. As Aoi drives Rin home, Rin admits she didn’t do much but at least she did something and wants to learn to become a better mage.