Yūya Kanzaki's Ouroboros Manga 'Nearing Climax' in Comic @ Bunch Mag - News - Anime News Network
Read Ouroboros Chapter 76 - MangaFreak
The gravestone in AnR which Eren visits has an ouroboros, a snake eating it's tail symbolizing eternal cyclic renewal or a cycle of life, death and rebirth. : r/ANRime