Wavelet cow was born into a coffin family, a kid of a ridiculous accident. Fortunately, he has been living in rural areas, where the simple surroundings does not make him feel that "laughing" is a serious problem. Growing up in the mountains, leaving his coffin shop to fight fights in the outside world, yet still needed to work in the funeral home. Wavelet experienced the vagaries of life at the funeral home, from the perspective of a funeral house handyman. Wavelet witnessed the departure of family, friendship, and love, as well as a new understanding on "Life's final halt." Wavelet cow ultimately learned to "laugh," but it was on the last day of his beloved uncle Hydride's life that he did.