Even though this is just still images, the desuwa crafting dance is cute af! I really want to see it animated.
ですわ!desuwa!
Is the desuwa thing some japanese brainrot? I've seen it in an ending of some anime and it feels degrading.
As others have said, desuwa is a speech flavor usually associated with rich noble ladies in anime, probably for decades now.
Desu is a normal, polite/formal sentence ending in Japanese both irl and media.
Desuwa makes it elegant, which is why MC used it. But as far as I know, it's not exactly used irl. So, from her friends' perspective, she's a weirdo who copies manga character.
I wouldn't say desuwa is a brainrot. Again, it's just a speech pattern associated with young noble ladies in anime.
Though from the perspective of the residents of this manga, it might count as a brainrot because MC uses it and they loves MC so much.