MangaStream illegally distributes high-quality scans of popular Manga issues in English language. MangaStream site has several translators who contribute to the issues of a particular series. MangaStream often provides colored cover pages and also invites contributors who are well-versed with the craft to paint the custom pages.
Their collection includes Hajime No Ippo to One Piece, and even One-Punch Man. The usage of such services can led to getting sued over copyright infringement since MangaStream is not authorized to distribute the materials.