World Trigger, Vol. 2 — Daisuke Ashihara

Destroy thy Neighbor! A gate to another dimension has burst open, and invincible monsters called Neighbors invade Earth. Osamu Mikumo may not be the best among the elite warriors who co-opt other-dimensional technology to fight back, but along with his Neighbor friend Yuma, he'll do whatever it takes to defend life on Earth as we know it.

Ever since meeting Yuma, Osamu has protected the feisty Neighbor's secret through a combination of covering up and taking credit for Yuma's actions. Turns out, though, Yuma isn't the only person Osamu's been protecting. He sets in motion a plan to help his friend Chika, who for mysterious reasons seems to attract Neighbors. And it also becomes clear that Osamu isn't covering for Yuma as well as he thinks…