After an asteroid explosion and meteor shower lit up the sky over planet earth, strange adorable bears began to attack and devour humans. The earthlings responded with violence of their own, and in the end, a massive barrier – the Wall of Extinction – was erected to separate man from bear. This fragile peace lasted until two high school girls encounter a yuri flower blooming – only to be shaken by the piercing warning of the Bear Alarm! Once again, bear and man- or bear and girl -will be pitted against each other in a deadly and mysterious showdown.