Wasteland Ark, but I Can Summon Heroic Spirits!

Xia En accidentally transmigrates into an alternate timeline of Arknights, a world rife with danger and overrun by monsters known as the Demons and the Seaborn. Fortunately, he can summon "Heroes" who have died in the real world from Originium. By fulfilling a Hero's wish, he can earn their talents and abilities as rewards! But as his bonds with the Heroes grow stronger, things gradually start to take a strange turn. Talulah: "I'll stand with Xia En and protect everything the Reunion Movement has built." Skadi: "Xia En, I'll stay by your side to the end of the world." Lappland: "Between me and Texas, which of us is easier to handle? Can Texas really manage to have Xia En all to herself?!" Hmm... Hmm?? Why does everything around me feel... so heavy?