Guys, the art has changed because it's really been a while since chapters 11 and 12. In Japan, it's very common/mandatory for BL mangas to be single volumes, and it usually takes a year to publish a volume of between 5~8 chapters. Sometimes, if the manga is popular or at the artist's request, those stories have sequels (so it's normal for subsequent volumes to be numbered but not the first if you have the first editions!), but sometimes those requests take years. The first volume is from 2021, and now there are 3 ongoing volumes, as far as I know. I assure you, an artist's style changes within four years!
Guys, the art has changed because it's really been a while since chapters 11 and 12. In Japan, it's very common/mandatory for BL mangas to be single volumes, and it usually takes a year to publish a volume of between 5~8 chapters. Sometimes, if the manga is popular or at the artist's request, those stories have sequels (so it's normal for subsequent volumes to be numbered but not the first if you have the first editions!), but sometimes those requests take years. The first volume is from 2021, and now there are 3 ongoing volumes, as far as I know. I assure you, an artist's style changes within four years!