Kumaria, an asteroid, erupted in deep space some time ago. The bits that remained formed a meteor shower that poured down on Earth, and for some reason, bears all across the planet rose up and attacked humans! In "Man vs. Bear," the bears ate the people and the humans shot the bears, culminating in an apparently never-ending struggle and a vicious circle of animosity. Finally, a massive "Wall of Extinction" was created between people and bears, resulting in a condition of mutual nonaggression... The world of humans. Kureha Tsubaki and Sumika Izumino of Arashigaoka Academy were alone one morning when they noticed the "Yuri Flower" blooming in a flower bed. They are both friends and lovers. The blossom