In a reality where it is accepted that people shift between varied parallel realms...
Koyomi Takasaki, who resides with his mother after his parents' separation, enters university preparatory academy. Because the environment is oriented and he feels clumsy, Koyomi struggles to form friendships. One afternoon, his classmate Kazune Takigawa confronts him, revealing she has come from the 85th realm where they were lovers.
