After getting caught in the rain, Rinko ends up with a fever. With Rinko's parents going out for the day, Yuka cancels her plans to get a special poster in order to take care of Rinko. Meanwhile, Natsumi and Saki are invited by their seniors to join a tennis tournament. After Rinko recovers from her cold, Yuka catches one of her own. As the others hang out without Yuka, they recall how it was because of Rinko's odd visions and Yuka's support that the four of them became friends and begin to threat what life will be like once Saki moves. Wanting Yuka to get better, the girls prepare to make a wish on the rock only for Yuka to show up back to health. After the girls accidentally tumble down some steps together, they all become able to see the whales Rinko sees in her daydreams.
ＣＤショップからの帰り道、突然の雨に降られ、凛子は風邪をひいてしまう。凛子を見舞いに来た優香だったが、今度は優香が風邪をひいてしまい、数日の間寝込むことに。先に回復した凛子を入れて夏海たちは優香なしで遊びに出かけるが、いまいち盛り上がらず、やはり４人は４人でいるのが一番楽しいのだと気づく。そんなとき、夏海らは４人が仲良くなったきっかけについて思い出す。それは、４年前。凛子が言った、ある言葉からだった。
