Subspecies Singularity, Eternal Curse of the Snowy Mountains

Having just experienced the Singularity of the Heroic Spirit Swordsman, the Salted Fish Master Ritsuka-kun who was in the grass-roots stage suddenly had a nightmare, and what accompanied this nightmare was a strange calling talisman, a gift from an unknown person... It led to a hidden history... The cursed snow-capped mountain city, the place of eternal slaughter, a girl who should never appear... And traces of a nobleman who is "absolutely impossible to appear"... The root, the origin, the Holy Grail, the old gods, the church, the magician, Chaldea... Everything converges at this moment, and everyone's dreams converge at this moment. In this cycle of nightmares, in this singularity where no heroic spirit exists, can Ritsuka find the only truth and redemption? PS: Fans of fgo, pretending to be heroic spirits, amusing themselves~