The Sound of Rain (雨音) is the 13th chapter of the manga series.
While taking shelter from the rain, Yuuri notices her helmet makes pleasant noises when getting hit by the water droplets. She borrows Chito's helmet and a several of cans then positions them under dripping water. Chito also joins in by using their lamp under the water drops. Chito suggests this is what they call "Music".
- The soundtrack that is played at the ending credits of episode 5 is named after this chapter.