"...Its form is..."
"A tsukumogami born from a sword."
?
Clang!
The Demon-Quelling Sword answered.
This is its true form.
?
That broken sword was embedded in the earth.
It looked long, yet short.
It looked fairly straight, yet crooked.
?
Many years ago, a sword was forged to stand in for the original blade, whose damage would otherwise weaken its combat power.
?
Now, a very, very long time has passed.
?
Covered in wounds, he was brought to this abandoned Honmaru by an unfamiliar Ichigo-niisan.
On the verge of breaking, he was rescued and brought to this abandoned Honmaru by an unfamiliar Kuniyuki.
Having killed his master and fled, he was led to this abandoned Honmaru by an unfamiliar Mitsutada.
Already corrupted, he was invited to this abandoned Honmaru by an unfamiliar... Hizamaru.
?
He said, "Ran, Kunishiro, Tsurumaru, brother, promise me you won't go out."
?
A person whose shape was uncertain, like everyone and yet like no one, stood in the moonlight.
?
Before closing the door, the unfamiliar Yagen-niisan, Sayo, Monoyoshi-niisan, Kane-san, Kiyomitsu, Azuki Nagamitsu, Mikazuki-dono, Iwatooshi, Hotarumaru... said to him, "I will protect you, no matter what."
"So promise me you won't leave this place."
?
There were so many people in this abandoned Honmaru. They died without resistance as their spiritual power faded, and that thing grew stronger and stronger, bringing back more and more people.
?
"...And its principle is?"
Theme: Treasure life, pursue your dreams, don't hurt others, and live well.
Can my wife change it? It feels very interesting.