Attack on Titan Vol 21

From the Kodansha edition

Locked in desperate battle with the man-eating Titans, the Survey Corps gets closer than ever before to Eren's basement and unlocking the mysteries of their walled world. But to get there, they will have to make a terrible choice with life-altering consequences for every surviving human soldier... The megahit Attack on Titan anime finally returns, streaming on April 1!

Source: Penguin Random House API