A book cover for "SAKURA" featuring an elegant black ink drawing of the silhouette of a single flower with a long stem and two leaves, against a light grey background in the style of Japanese art. The title is written at the bottom center using soft lettering. The top half of the page is left blank. Include the text "lio" in a vintage-style font at the upper right corner, and the name "colossal calla lily" beneath it. The overall tone should be minimalist yet captivating.+ use text