Synopsis

On a hot summer day, three children, unable to go on a vacation far away, start playing water guns in a neighborhood alley. The children transform into tomatoes, clouds, and yellow rabbits as soon as they shoot their water guns, and they giggle and run around the alley, falling in love with water gun play. A cat and a mouse who pass by and accidentally receive the water gun baptism also transform into an earthworm and a bat. 

The three children, who seem to have been transported to a fantasy world, shoot water guns frantically. The flowers, which were wilted in the heat, vigorously raise their flower stands and sparkle after being hit by the water gun. The dinosaur in the tie breathes fire and yells that he is angry. The kids shoot water guns at the angry dinosaur. The dinosaur chuckles and yells “cool” and turns back to green. They also spray a giant squid with a water gun that spews black ink. 

The three children become heroes who save the day for the world's hot beings. Suddenly, they go to battle the sun, the embodiment of heat. High in the sky, the kids shoot water guns and freeze the sun. The frozen sun is actually cool and pleasant. After fighting the sun, the warriors, the water gun trio, return to reality after playing with water guns. The children's midsummer is temporarily cooled by playing with water guns.