Ratman is a dark comedy superhero parody manga about a mild-mannered student named Shuto Katsuragi who becomes the titular vigilante after inheriting a powered suit from a mysterious scientist. Unlike typical heroes, he is a bumbling coward who struggles to live up to the costume’s legacy while dealing with real-world problems like debt and school. Readers enjoy the series for its witty satire of the superhero genre, slapstick humor, and surprisingly heartfelt moments as Katsuragi grows into his role despite his flaws.