Since I don't know the exact story, it could potentially be about a figure who met a watery end and was considered beautiful in a way that defies normal expectations. It could be a story about love and loss, where the person who drowned was remembered in a special way that made them seem the most beautiful. It might also be a story with a moral or lesson, perhaps about the transience of life and the power of memory.
Manga is popular because it offers a wide range of genres and stories to suit different interests. The art style is often unique and visually appealing.
Manga's popularity stems from several factors. One is the depth of character development. Characters in manga often have complex personalities and growth arcs that readers can relate to or root for. Another reason is the accessibility - it's widely available both in print and online. Also, the diversity in storylines, from fantasy and romance to action and mystery, keeps readers coming back for more.