A self-made arrancar named Arturo Plateado once stormed Soul Society, but was trapped beneath Sōkyoku Hill by the Gotei 13 two-thousand years prior to the start of Bleach. When the Sōkyoku was destroyed during Ichigo Kurosaki's rescue of Rukia Kuchiki, the seal placed on Arturo was broken and he was freed.
Arturo decides to impersonate various figures, his disguises ranging from captains to zanpakutō spirits, in an attempt to trick others into regaining the pieces of the destroyed Sōkyoku in order to absorb them into his body and become more powerful. Depending on the game's outcome, he is either purified and defeated or obtains the Sōkyoku and carries on to decimate the Soul Society.