Fate/Bleach

There are two worlds which they have boy name Riku, one known as Riku kido a classmate and friends with ichigo kurosaki and rest, he posses of a soul reaper but can utilize vizard mask and his zanpakuto called izanagi no okami, the other riku is a master along side with miss fujimaro gudako and mashu, but unlike other masters he can created replica weapons since holds dna of a"emiya" on his birth and other mysterious divine powers.

but when Riku from another world dies and trigger some holy grail merge two worlds which will complicate The riku of nasuverse to Riku of bleach world.

but now the holy grail is being hold by an unknown villain, his mision is to retrieve it and survive of hollows,quincy, arrancar and main villains of bleach that were revive by the holy grail and must team up with soul reapers.

the battle for the holy grail thousand year war has began.