Yuu and the others help Ahegao Double Peace-sensei at a doujinshi exhibition. There they encounter the Kanzaki sisters who run a major circle. After getting caught up in the sore relationship between them and Ahegao Double Peace-sensei, Yuu gets roped into a doujinshi competition!
A little sister who loves her brother 
so much, her S&M side has awoken!
Die SM-Seite der kleinen Schwester,
die ihren Bruder so sehr liebt, ist erwacht!
¡Una hermanita que ama a su hermano
y despierta su lado oscuro!
¡Una hermanita que ama a su hermano
y despierta su lado oscuro!
La sœur qui aime son frère
plus que de raison découvre le SM !
L'amore folle verso il fratello ha risvegliato
la parte sadica della piccola sorellina!
Depois de amar tanto o irmão,
a irmãzinha aflorou seu lado sádico!
Сестрёнка настолько любит
брата, что впала в садизм!