The left arm of Kawauso Maniwa, distinguished among the Twelve Bosses of the Maniwa for his Infovac, which allowed him access, upon contact, to the memory and history of inanimate objects – was now grafted onto Hohoh.
And with this arm – he delved into this sword.
Just as that genius Nanami Yasuri had used her eyes to see through Akuto the Eel, upon finding it enshrined atop Mt. Shirei, thus learning what the sword could do and how it should be used – Hohoh Maniwa had done the same, in his own way, with Dokuto the Basilisk.

Katanagatari Omnibus 3, Page 260