Sakamoto Mashiro (坂本 舞白; born December 16, 1999), known mononymously as Mashiro (마시고), is a Japanese singer under 143 Entertainment. She is a member of the girl group MADEIN. She is also a former member of the project girl group Kep1er. Sakamoto Mashiro (坂本 舞白; born December 16, 1999), known mononymously as Mashiro (마시고), is a Japanese singer under 143 Entertainment. She is a member of the girl group MADEIN. She is also a former member of the project girl group Kep1er.