Miho Maeshima was born in Tokyo on July 26, 1986. She reports that her first experience with sex was with her boyfriend in his closet. His mother had come into his room with a vacuum cleaner while they were beginning the act, and they hid in the closet where they finished. She says that she has not had sex with a lot of men, since she remained with this boyfriend for another four years.
Maeshima entered the video industry in August 2006 with The Naked, an "image" video, consisting of nude modeling without sex. Her AV debut, Cosplay - Marshmellow Shame H, was released the same month.
Her April 2007 release, Illegal Invasion of Tits, was Maeshima's first for the MAX-A label. This video had Maeshima in the role of a woman who breaks into a wealthy man's home intending to rob him. The owner catches her and subjects her to various forms of humiliations employing swearing, lotion, and a vibrator. When the rich man's servant arrives on the scene, Maeshima is forced to perform fellatio on the two men.
In Crazy Angel, from May 2007, Maeshima plays an angel who is sent to earth to find the Stone of Life, which she has dropped. This scenario allows Maeshima to work in the popular cosplay genre of AVs by donning various costumes, including that of a waitress.