Muramasa had awakened not long ago.
The first thing it did after awakening was search for Koga Kuchiki, but no matter what it did, it could not sense Koga Kuchiki's spiritual pressure.
Yet it knew Koga Kuchiki was not dead. Otherwise, as Koga Kuchiki's Zanpakuto, it would have died along with him.
The fact that it itself had not died was the best proof that Koga Kuchiki was alive.
Muramasa knew what had happened to Koga Kuchiki back then, so it guessed that Koga Kuchiki had likely been sealed away.
Thus, it began secretly searching for the location of Koga Kuchiki's seal, with the Kuchiki Clan being its first target.
Muramasa knew very well that Ginrei Kuchiki definitely knew where Koga Kuchiki had been sealed.
However, it could not go directly to Ginrei Kuchiki, because he certainly would not tell it.
So Muramasa used the Kuchiki Clan's estate as its base, secretly watching, moving about, and searching.
Finally, not long ago, it confirmed through a conversation between Byakuya Kuchiki and Ginrei Kuchiki that Koga Kuchiki had indeed been sealed.
At the same time, Muramasa learned something that interested it.
That was, a Zanpakuto with abilities similar to its own had appeared in the present-day Soul Society.
Muramasa had always held one wish: to build an ideal nation with Koga Kuchiki.
After learning that Koga Kuchiki had been sealed away, that wish only grew stronger.
It wanted to overthrow Soul Society, welcome Koga Kuchiki's return, and make Koga Kuchiki the king of Soul Society!
Driven by such an intense desire, Muramasa began brewing a world-shaking plan: to make every Soul Reaper's Zanpakuto rebel.
Especially the Zanpakuto of captain-class Soul Reapers. They would undoubtedly become its greatest support.
To that end, it first had to build up its strength.
Although Muramasa could