Color of Sky, Color of Water / Sora no Iro, Mizu no Iro

This is a story about two sisters, Asa Mizushima and Natsume Sorayama, who are both in love with Hajime Saisho. Instead of fighting for his attention, they decide to share it among themselves. However, time is working against them, because by the end of the summer, Hajime will be gone.

Realizing that they don't have much time left, the girls decide to spend it with Hajime. But the day of farewell is inexorably approaching. Will they be able to win the young man's heart?