Touko Hizuki is the school nurse and has the power of invisibility through the use of her bandages. She is Ayana Hizuki's older sister and just like her, Touko also has massive breasts and loves to tease Haruki with them.

Touko is a naughty and carefree woman, she loves wearing provocative clothes and leaving her gigantic breasts exposed to attract the attention of the students at school, especially Haruki, where she is always approached to test her experiments. She also loves her little sister Ayana, and is always groping her massive breasts or spanking her booty just for fun (or to satisfy her horny moments).