Birth place: Mie Prefecture, Japan
Mengo Yokoyari dropped out of high school to become a mangaka assistant. She had wanted to become a manga artist since little.
Yokoyari made her debut in 2009 with Maken☆H Zemi!, which was published in Magazine WOoooo! and later collected as part of the Mokkai Shiyo? compilation.
After contributing regularly to the magazine, she was invited by a Futabasha editor to draw a series for one its magazines. It would materialize as Haruwaka, Yokoyari's first serialization work.