Mizunoke: Suiiki Kaii Kitan Imayou

Mizunoke are monsters and spirits that appear at the water's edge. While many have been driven out with the advent of modern civilization, they can still be found within this town of Uroko. One day, a young girl named Kichi appears like a storm before Sayo, an employee of the Mizunoke Extermination Center. Though Kichi claims to be searching for her missing brother, there seems to be something more at work...

(Source: MANGA Plus)