Volume 0: Prologue

Shirou dies, and the corrupted grail in his soul grants an incomplete wish, reincarnating Shirou's soul into a new world. He lives a normal life until tragedy strikes. In his desperation, the sleeping UBW awakens, leaking memories of a past life. With an old soul and a new world, Shirou embarks on an adventure, seeking what he has lost.

Originally started in fanfiction.net and shared to wattpad.