♂ m

The protagonist. He's brought in to Popuri's class to demonstrate various sexual acts with Merumo. He doesn't want to hurt Merumo and hesitates when told to have se... read more

The protagonist. He's brought in to Popuri's class to demonstrate various sexual acts with Merumo. He doesn't want to hurt Merumo and hesitates when told to have sex with her but if he refuses he'll be given the death penalty.

♀ f

The teacher of Merumo's class. She feels the best way to teach her class of girls sex education is through a live demonstration. She threatens Sex no Onii-san with death if he won't do various sex acts with Merumo. She often speaks... read more

The teacher of Merumo's class. She feels the best way to teach her class of girls sex education is through a live demonstration. She threatens Sex no Onii-san with death if he won't do various sex acts with Merumo. She often speaks to some sort of superior or organization about what's happening in her class.

♀ f 10

10 year old 5th grade elementary school class president of Popuri's class. Since she's class president she's chosen by Popuri to demonstrate sex for the class. She's easily embarrassed and doesn't want to have sex in front of the cl... read more

10 year old 5th grade elementary school class president of Popuri's class. Since she's class president she's chosen by Popuri to demonstrate sex for the class. She's easily embarrassed and doesn't want to have sex in front of the class so Popuri threatens her to get her to comply. Eventually she comes to enjoy it though.