User blog comment:B214/General Discussion/@comment-73.46.6.122-20170505203143/@comment-1359322-20170505233243

If we follow the actual Japanese myth the Totsuka-no-Tsurugi are actually a group of swords wielded by different Gods like Izanagi, Susanoo and Takemikazuchi.

Now that's the real myth, i don't know how much Ishibumi changed that in DxD, especially since Ishibumi changes things to fit his story. Though i suppose Ishibumi kept the multiple swords in a class thing. As to how those swords actually are, no one knows yet at the moment.