any Manga. also, explaining what exactly it is would be helpful :)

[starrynight17]

?

[Shawna]

Attack on Titan, Vol. 1: The world has became overridden with giant human eating titans. Humanity built walls to protect the remaining humans but a giant titan appears that tears down the first wall.

Sailor Moon, Vol. 1: Sailor guardians protect the universe from evil.

Vampire Knight, Vol. 1: A school with a day class (humans) and a night class (vampires). Two students are tasked with keeping the school's secret about the vampires.

[CraftyChara]

Do you mean you want a manga that explains what manga is? Or do you want us to recommend Manga books and explain what it is about?