I don't know Japanese, but it's quite similar to Watanagashi in spelling, sound, and theme. Watanagashi is a festival in the anime series Higurashi: When They C

I don't know Japanese, but it's quite similar to Watanagashi in spelling, sound, and theme. Watanagashi is a festival in the anime series Higurashi: When They Cry - kind of the ultimate murder mystery spread across 4 seasons.