In the world, elements such as earth, water, fire, and air are gradually invading the world. Now, it is called the Elemental world.

There was a boy with the element of water— his name was Tsukishima Kei, a town manager. But one day, while he was on patrol, he was unfortunately caught in a water pipe and swept into the house of a girl with the fire element.

"Oh, maybe your house has a leaky pipe so I'll report it to the mayor."