Girlfriend, Girlfriend, Volume 15 (Girlfriend, Girlfriend #127-135)

Things are looking rocky for Naoya and Nagisa when Saki proclaims that she can no longer be part of the polygamy. When faced with Saki's question of whether she preferred a normal, one-on-one relationship or this two-timing thing they have going, Nagisa comes to her answer... What is Naoya to do now that Saki has finally accepted Nagisa's feelings and her own conviction begins to falter...?