Now with Maki-chan. ~Pure Innocent Angel Yuki Misono Arc~

Story

One night, 'Seiichi Sakonji,' an unsuccessful light-novel author and eroge writer, happens to witness the beautiful girl next door, 'Maki Sanjo,' indulging in masturbation on her balcony. Maki has talent and beauty and gives off a chaste, refined air. However... in reality she's... a hypersexual, super-lewd type (and a virgin)! An unexpected approach from Maki-chan. Maki-chan's ultra-perverted demands won't stop for the bewildered Sakonji. Now dating Seiichi, Maki is having sex to her heart's content. Then one day, Maki's little sister 'Yuki Misono,' who ran away from their family home, comes tumbling into the two of them's lives. Seiichi and Yuki are both extremely shy. To improve their awkward relationship, Maki ends up scrambling to help. Yuki comes to wake up Seiichi as he sleeps deeply. Yuki's figure shaking Seiichi awake is—of all things—naked but for an apron. Yuki, the little sister who carries the same blood as Maki's ultra-perverted lewd constitution. From pure, innocent Yuki's body, an innate eros seeps out. She shares her life with Seiichi in the naked-apron look. Through the gaps in the apron, Yuki's immature little swellings leap into Seiichi's view. Seiichi desperately resists his own desires so as not to lay a hand on this little angel who knows no impurity. But those efforts are in vain, and begged by the angel—who'd been coached by Maki—for a lecture on sex, eventually... the angel transforms into a fallen angel.