This is a story that begins after the world ends.
One day, a new student transfers to the school attended by the story's protagonist, Hoshimiya Eiji. She's an attractive girl named Kurenai Rin, and Eiji immediately wants to get closer to her. Then, as Eiji is on his way home from school, who should appear behind him but the new student, Rin?!
[Source: Crunchyroll]