It depends on the ending you got. There's two, and one centers around the cat (Ryuk) afterwards, but I'm not sure if you got that ending or not, and I don't wanna spoil anything by telling you the wrong one accidentally 🙃
Yeah I feel that lol- And I'm guessing that you probably got the su*c*de ending then? That's what I figured you meant, I just wanted to be careful. If you play for the other ending, by making sure he DOESN'T get to 1M (choose for him to not tell his followers of his goal and not do the karaoke stream, then you should be all set), you'll get a 'second' ending, where you find out the truth about Ryuk, and who he is. Nothing happens to the cat in the su*c*de ending, but trust me, in the other one, you will NOT care for what happens to that demon 😭