Girlfriend, Girlfriend volume 4

Milika forcefully steals Naoya's first kiss, leaving Saki and Nagisa absolutely devastated. In order to deepen their bond, Naoya decides to take the two girls out on a vacation date to the hot springs! But for some reason, Nagisa is keeping her distance from the two despite this being a vacation for the three of them! What's more, Saki's friend, Shino, intervenes on their trip, determined to find out if Saki's being two-timed!! What's in store for these three on their much-anticipated date?!