"20th Century Boys" is a story about a group of friends who grew up in the 20th century. They were all born around the same time and they loved to play together. As they grew older, they started to realize that there was something strange going on with the world. People were disappearing and things were just not right.
One of the friends, Kenji, eventually became a rock star, but he never forgot about the strange things that were happening. As it turns out, there was a group of people who were planning to take over the world and Kenji was the only one who could stop them.
The story is really exciting because it keeps you guessing about what's going to happen next. Will Kenji and his friends be able to save the world? Will they be able to stop the people who want to take over? You'll have to read the book to find out!