The Uncle Teacher of the Crossover World

This is the story of a man nearing forty who transmigrates into a world where various anime have been blended together. What will happen when this middle-aged man becomes a teacher and meets the troublesome little girl Rin Kuju, an overly self-conscious teacher, the yandere Kotonoha Katsura, and many other problematic students? A slice-of-life story.