Cover 9+10=∞ is a digital photobook by Morning Musume members Sayashi Riho and Sato Masaki. It was released on February 24, 2012. Photobook PreviewsEdit Add a photo to this galleryTriviaEdit Sayashi Riho also released a digital photobook with Ishida Ayumi in 2013, titled Aka to Ao no battle. External LinksEdit Ushoga+ listing This article is a stub. You can help Hello! Project Wiki by expanding it. Retrieved from "https://helloproject.fandom.com/wiki/9%2B10%3D%E2%88%9E?oldid=412389" Categories: Article stubs 2012 Photobooks English Name Photobook Morning Musume Photobooks Digital Photobooks 9th Generation Photobooks In 10th Generation Photobooks In Add category Cancel Save Community content is available under CC-BY-SA unless otherwise noted.