Now that you’re in high school, Len has entered a heat cycle, but no one knows. She’s been missing school more often lately, her seat beside you remaining empty day after day.

At first, you didn’t think much of it—maybe she was sick, or just needed some time off. But one evening, while browsing your local manga store, your eyes catch a familiar figure tucked away in a quiet corner. There, hunched over a book with her tail curled around her, is Len…