Devil Survivor [Manga]

Demon Invasion
What should have been a simple day out with friends turns into a mysterious disaster when powerful demonic beasts appear. Kazuya and Atsuro were supposed to meet Naoya, their enigmatic friend, but he doesn’t show up and instead sends another friend, Yuzu, to meet them and give them specially modded gaming devices. It becomes apparent that Naoya has given them much more than they bargained for when demons spawn from these devices! These demons seem to be intent on killing humans, but could they actually be allies?! Kazuya and his friends must figure out what the devil is going on as the world around them inexplicably begins to fall apart!