Arknights: A Price Can Change Everything

For some reason, a student named Wu Yuxuan found himself on Terra. In the land of Ursus, he encountered the Infected Enforcement Squad. In the midst of a crisis, he gained an ability called Sacrifice. After resolving the crisis, he set off for Chernobog. After many ordeals in the city, he finally joined Rhodes Island and became involved in the story, under the codename Entropy. "The facts already set in stone may be impossible to change, but the future is still ours to shape." That's what he said on the deck, though his companions beside him all said they didn't believe him.

I'm new to writing, and my update schedule is irregular. If anything differs from the game, just treat it as my own interpretation. After all, I haven't finished the main story of Arknights yet, so I'm relying on hearsay and looking things up on the wiki.