Prologue: Travel to Past

In the year of 2021, the mystery siblings came from long distant of pasts, but claims as Emiya Shirou's children from the future! Here to help the present in order prevent of the ancient demon called Diablo rule over demons.

Now Shirou have to team up with Touma Schwarzer and their allies to stop bad future from happening.

(Partner co-author with @ArseneLupinX)