Upon arriving at their accomodation, the girls meet Chiharu Okiyama, the twin sister of the lifeguard from earlier, Koharu. Whilst trying to hide Saki from the neighbours in the hot springs, they inadvertently discover a wishing rock in the hotspring that causes Saki to turn invisible, unable to be seen or heard by the others. Later that night, as Natsumi talks with Yuka and Rinko about her desire to stop Saki from moving, they remind her that they'll still be friends regardless. The next day, the girls join Chiharu around the town. As they explore the hospital Saki's father will work at, Koharu becomes hostile towards them as he didn't want the doctor who used to work there to be replaced, but Chiharu assures her that she isn't the only one who misses him. As Saki comes to accept that she'll be moving here, she becomes visible again.
宿に着いた夏海たちは、沖山千晴という女の子に迎えられる。
彼女は海岸で出会った子の双子の姉で、夏海らと同じ中学２年生。
夏海らが下田から来たというと、千晴は紗季の家族について尋ねてきた。すでに千晴たちの近所では、紗季ら水越一家が引っ越してくることは有名になっていたのだった。
戸惑いを隠せない紗季を見て、夏海は………
