B.I.O (Rewrite)

after the six Holy grail war the son and daughter of
Shirou emiya the king or Blade or demonic blacksmith
and arturia pendragon the king of knight

they won the six holy grail war but in the end
they lose everything that they have because of
archer gilgamesh

then they were granted a wish
the wish to live a normal happy live but that wish
will soon be corupt because of the falling piece of
the corupt holy grail

then a group of devil angel fallen angel and yokai
want to know about this and they want the grail
will the sibling able to keep them out or some
devil perage keep buging their ass

until they get the information about them
how will they able to survive this world
without killing anyone

disclaimer : i do not own fgo and dxd