"Since how many days you haven't slept , chuuya ?" "That's none of your concerns, dazai!!"

Shadow is immortal. Out of all the things he hides, he doesn't ever try to hide that. Many people don't realize this is the reason he refuses to make friends, which is why Rouge and Omega are oddities. Hell, he's even starting to regret ever getting attached. He knows he'll lose them both eventually. But... what happens when somebody he hates gains immortality? What happens when the only other person cursed to be at the end of it all... is his rival? I have no ownership over anything in the Sonic brand. This is a fanfiction.