Originally Posted by TAI JASON
Any information what "it" is? Cave Event?!? Is it an Code for some Beta?
It may be either an Invitation to a CAVE event (not unlikely though), but I'm guessing its a special/extra game mode or something like that, since CAVE also made Limited DLC cards for Futari's 1.01 mode and DeathSmiles (JP) Voices add-on. But those are only to First Printed/Release Editions of the game.