Seraph of the End, Vol. 30

Yu and Mikaela dive into the past in search of their oldest memories, and they pop out in a shocking time well before the birth of humanity…when dinosaurs roamed the earth! They continue on and run into an angel that looks suspiciously like Mikaela, who leads them to a mythical city with an enormous tower that extends into the heavens. What sort of mysteries will they encounter there?

Volume 30 of the Seraph of the End manga series by Takaya Kagami.