From Kodansha:
In this post-apocalyptic sci-fi story, humanity has been devastated by the bizarre, giant humanoids known as the Titans. Little is known about where they came from or why they are bent on consuming mankind. Seemingly unintelligent, they have roamed the world for years, killing everyone they see. For the past century, what’s left of man has hidden in a giant, three-walled city. People believe their 100-meter high walls will protect them from the Titans, but the sudden appearance of an immense Titan is about to change everything.

Original Manga

Official English Translation:
Kodansha US, INKR, Azuki, Manga Planet, MangaPlaza, Coolmic, K MANGA (U.S. Only)

Note: The most notable award wins and nominations follow.
Won the Kodansha Manga Award in the Shōnen category in 2011, the Eagle Award for Best Manga and the 27th Harvey Award for Best American Edition of Foreign Material in 2014, the 1st Sugoi Japan Award in 2015, the Noma Publishing Culture Award in 2021 and the 53rd Seiun Award for Best Comic in 2022.
Nominated for the 4th annual Manga Taishō Award in 2012 and the 16th and 18th annual Tezuka Osamu Cultural Prize in 2016 and 2018.