Lost World: Shikaban

In a world where science and mystery intertwine, a peculiar case draws together an unlikely group of investigators. When a wealthy collector becomes the center of a criminal investigation, his devoted butler and an unusual rabbit-eared companion find themselves working alongside a determined private detective known as Mustachio. Their search for answers leads them to the laboratory of Professor Hoyoku Shikishima, a brilliant scientist whose groundbreaking research into the nature of consciousness and the boundaries between human and animal may hold clues to the mystery. As these disparate individuals begin their investigation, a strange celestial phenomenon captures the world's attention - the planet Mamango, believed to be an ancient fragment of Earth itself, has appeared in the skies and is drawing ever closer. The professor's research into this mysterious wandering planet may prove more connected to their case than anyone initially suspected. (Source: MangaDex)