Metamorphosis manga is all about showing the process and consequences of radical changes. It could be a person evolving into something completely different or a situation that transforms in unexpected ways. The storylines are usually filled with drama and surprises.
The ending of Emergence manga was quite unexpected. The main character made a final sacrifice that brought a sense of closure, but left some fans wanting more.
I'd suggest checking out dedicated manga apps like Manga Plus or Crunchyroll Manga. They often have a wide range of titles, and there's a chance Emergence could be among them.
There are several options. Some people find it on dedicated manga websites such as MangaPark or MangaFox. But be careful, as not all of these sites might be legal or safe. Another option is to check if your local library has digital or physical copies available for borrowing.