Model and designer Masahime was born on November 7, 1972, in Yokote City, Akita Prefecture. Her real name is Masako Mori. She enrolled in Vantan Institute College in 1990. While still a student, she made her modeling debut in the magazine "anan." After graduating, she continued working as a model, but in 1995 she married soccer player Atsuhiko Mori. The following year, she gave birth to her first daughter, which prompted her to begin designing her own clothes. In 1999, she founded the children's clothing brand "hug o' war." After opening a directly managed store in Jiyugaoka, she began designing women's wear as well. Her work gained public attention through a series in the lifestyle magazine "LEE." In this series, Masahime shared her lifestyle, and her unique style and fashion suggestions were met with overwhelming support from readers. In 2002, she signed an exclusive modeling contract with the magazine, appearing in its pages and releasing numerous collaborative items. In 2003, he opened the second Hug O' War store and also Cross & Cross, which sells linen kitchen cloths. In 2014, he became the editor-in-chief and launched the lifestyle magazine SENS de MASAKI.