Mari Nakai was born as a woman named Mari Nakai or 中井真里. She graduated with an economics degree from Hitotsubashi University and began her career as a mangaka while working as an office lady. Known for being a social mangaka, she often hangs out with close friends such as Megumi Mizusawa, Miho Obana, and Ai Yazawa. Her debut work was in 1984 with the yomikiri "Radical Romance" in Ribon Original magazine. Since then, she has produced a series of popular titles including Quartet Game, Handsome na Kanojo (Handsome Girl), Marmalade Boy, and Random Walk. Many of her works are available throughout Europe and Asia. She enjoys watching movies like "Practical Magic" and TV shows such as the Powerpuff Girls and soccer games. Her fashion sense is inspired by beads-based designs, shopping, traveling, and other activities.