Hogwarts: Frog Cub Brings Back the Dragon Slayer Crystal at the Start

Summary

Lou En traveled to the Harry Potter world and received an admission letter from Hogwarts.   He also raised a traveling frog cub that can travel around the world and bring him some specialties from time to time.   "Your frog cub brought you a special travel product [Thunder Dragon Slayer Crystal]"   "Your frog cub brought you a special travel product [Eternal Mangekyo Sharinggan]"   "Your frog cub brought you a special travel product [Time Magic Scroll]"   "Your frog cub brought a guest [Young Erza (Queen of Fairies)] to visit!"   When the wizards saw the figure swallowing the thunder in the sky, the entire wizarding world was dumbfounded.   Dumbledore: "He's the most talented wizard I've ever seen in my life!"   Voldemort: "He's the Dark Lord, darker than me!!"   Hermione: "He's the most knowledgeable man in the world! My dear Lou En!"