'Attack on Titan' is also very popular. It's set in a world where humanity is on the verge of extinction due to Titans, giant human - like creatures. The story is dark, gritty, and full of mystery. It keeps readers on the edge of their seats as the characters fight for survival and try to uncover the secrets of the Titans.
Sure. The value of manga can go up depending on factors like its rarity, popularity, and condition. For instance, first editions or signed copies of popular series might become more valuable over time.