Mayumi is the sexually aggressive gym teacher who loves to hunt for young boys with her best friend Saeko.
Mayumi is a main character of the manga series Secret Plot that was created by NeWMeN. It originally began publication by Fujimi Publishing's Plaza Comix in 1995. Saeko was the lead character in the original one shot chapter "Junkie Teacher", back when she was called Miki Yamaguchi; but by chapter two the series followed Mayumi's story more often.
Her first appearance was in Secret Plot CH. 2 "Secret Plot".