The story is set in the not-so-distant future. Five"Black Points" unexpectedly appeared all over the globe as portals to parallel worlds. Immediately after creatures began their invasion from these types of portals. These critters are five worlds' inhabitants --the worlds in various time frames. As a way to make sure their own future timeframe survives, the five invasion forces each battle to wipe out the time frames that are other. The key is just one card-shaped apparatus.