The 6th installment of the 15th anniversary year project is a collaboration with S1's popular exclusive actress Yumeno Aika-chan! My sister-in-law, Aika-san, is cold to me. One day I was watching AV and suddenly came into my room! And for some reason we decided to watch AV together! That night, a secret saffle relationship began, saying, "You should take responsibility for not being able to sleep." Is your shy attitude when you're with your family a countermeasure to your brother's finding out? Or just a cover-up? A Forbidden Relationship Spree With Complete Subjectivity! Domestic Affair Cohabitation With A Sister-in-law Who Can't Be Obedient!
