Naturally, many of the most popular anime wouldn’t exist if they didn’t have a manga to be adapted from, and that creates a symbiotic relationship where the success of a manga helps make its anime more successful which, in turn, helps make the manga even more successful.
The manga industry is one that just keeps getting bigger with every year, and there are naturally some manga that end up becoming best-sellers. While anime tends to be the field that gets the most attention, manga is just as big of an industry, if not bigger. Naturally, many of the most popular anime wouldn’t exist if they didn’t have a manga to be adapted from, and that creates a symbiotic relationship where the success of a manga helps make its anime more successful which, in turn, helps make the manga even more successful.