Deviliser is the new game trademark from Index, parent company of Atlus. Both companies are now owned by Sega.
It’s a small one, essentially just a name. The trademark filing was picked up by Siliconera and the jury’s out on what, exactly, this is. The site reckons it could have something to do with the Shin Megami Tensei series.
Speaking of which, Persona 5 and three Persona 4 spin-offs were announced at the weekend. Get the details through the link.