User blog comment:Crimson and Darkness/Volume 24 discussion blog/@comment-28626666-20171226130555/@comment-30924344-20171230154550

The only info known in relation to the second question is that the the two Longinus were found through Ajuka's game, which is most likely related to the game "Innovate"  (common name: Electric Bee) from Ishibumi's first work, Denpachi (which literally means Electric Bee). The wielder of both Longinus is supposedly the protagonist of Denpachi, Kanzaki Mitsuya. Characters in Denpachi fight using powers from their phones so there can be specualtion Innovate Clear is the phone Kanzaki uses in Denpachi - its power possibly being a sword (as shown with Kanzaki wielding one on the cover) with abilities.

Only known info on Kanzaki for now is he known as First Dark and is the hero of Denpachi.