I personally don't see much difference, he and Megumi are still about the same size as one another. Though if you see a difference it could be chalked up to Tsu having to now focus on both school work and athletics. It would make sense if he got slightly less buff because of focusing on school and Meg and less on fighting.
Here's to different shots of him from earlier and one from the recent chapters to show the difference
https://www.mangago.me/read-manga/megumi_and_tsugumi/mdx/br_chapter-194561/pg-25/
https://www.mangago.me/read-manga/megumi_and_tsugumi/mdx/br_chapter-231040/pg-22/
yeah i'm thinking the same, the drawing style got simplified, both mcs looked more grown-up and manly in the initial volumes which gave the story its charm, and now it's kinda sad
Is anyone else sad about how Tsugami's appearance was twinkified? In the early chapters he had a more bulky and tough looking appearance that fit his delinquent character. Now he looks so wimpy