Sumika goes with her family on a trip to visit graves and an obon festival, promising to call Ushio when she gets there. However, the house they were meant to stay at got damaged in a fire, so they are relocated to a temple on a mountain which, much to Sumika's chagrin, is out of her cell phone's range, meaning she can't contact Ushio. The next day, Sumika is put in charge of looking after some children. Whilst visiting the river, one of the children, Teru, falls off a tree into the river, and Sumika goes to save him, getting her cell phone wet in the process. Meanwhile, Ushio gets concerned that she hasn't heard from Sumika, wondering if she got caught up in an accident or something. Teru apologises to Sumika for causing her trouble and gets grounded. When Sumika's phone starts working again and Ushio calls it, Teru rushes it over to Sumika who is attending a festival and the two finally get to talk to each other.
田舎の祭りと墓参りに合わせて泊りがけで帰省することになった純夏。汐には「向こうについたら電話をかける」と約束して出発する。
だが、宿泊予定だった親戚宅でボヤが起き、一家は急遽山奥の講武館へと泊ることに。そこは携帯の電波が届かないので、汐に電話をすることができない。
翌日も、なんとか汐と話したいと願う純夏だったが、親戚の子供たちの世話に追われてなかなかチャンスがない。
その頃汐は、一向にかかってこない純夏からの電話を待ちわびていた。
「話したい」と思えば思うほど、二人の想いは募っていく。
Sumika tiene que ir con su familia en un viaje para visitar unas tumbas y un festival obon, prometiéndole que le llamaría en cuanto llegara. Pero, la casa donde se iban a quedar resultó dañada durante un incendio, entonces fueron reacomodados en un templo en las montañas, y por mucho que Sumika le buscaba no había señal de celular, y no podía hablarle a Ushio.
