Humanoid bears once coexisted with humans. However, a meteor shower that struck Earth had a strange effect on bears worldwide: they suddenly became violent and craved human flesh, sparking an endless cycle of bloodshed where bears ate humans and humans shot bears, causing them to forget the lively relationship they once shared. The "Wall of Severance" was thus constructed, separating the two civilizations and maintaining peace. Kureha Tsubaki and Sumika Izumino are two lovers attending Arashigaoka Academy. When two bears that have sneaked through the Wall of Severance and infiltrated the academy arrive, their relationship faces a grave threat. The hungry yet affectionate bears, Ginko Yurishiro and Lulu Yurigasaki, seem to view the bear-hating Kureha as more than just another meal. By getting closer to her, they trigger an unraveling of secrets that Kureha may not be able to bear. When their relationships provoke the Invisible Storm, a group that maintains order within the ideological school, the girls must stand trial with their love. They embark on a journey of self-discovery en route to attaining true love's "promised kiss."