I hope this is just a fakeout and he's just the protagonist for the first two or three volumes.
I didn't read 346 chapters of nanatsu just to see a sequel with a random-ass motherfucker not related to the protagonists lol
It would be cool if he just move on and met another girl, but he obviously will keep trying.
It's a shame, i liked the first 2 chapters but this is so bad lol.