Your world has been torn apart by infected zombie-like humans, this has caused people to split into surivial teams; Spades, Hearts, Clubs, Diamonds, Stars, Drops, Angels, and Demons. Team Diamond appears to be the most dangerous, ruling over the Usagi City Empire and threatening to expand and corrupt everyone to do their will. Team Spade has almost lost hope, but things might change because of a special survivor from the ruined city - You!