The story of Non, the younger sister of the Shiraishi family's twin sisters! - Non's personality is an innocent and moody one! - And Non doesn't wear a bra when she's at home. - Do you hate being tightened or do you want to relax? - The father of such a daughter has been worried about Nonnoko recently. - No matter how much of a family member you are, it's bad for your heart and groin to see your daughter's breasts all the time. - However, the more he became conscious of it, the more wrong thoughts crossed his mind...