One day after purchasing a melon soda and drinking it, a girl appears, taking his first kiss. She is part of a government project called Akikan, which created girls from aluminum soda cans and steel soda cans to fight. The victor's type will determine if the government will continue to use aluminum or steel. He names the girl Melon, and she is capable of creating soda-magic using the carbon dioxide she lives off of. She often uses it to attack Kakeru for being a pervert. Kakeru is responsible for making sure Melon maintains her carbon dioxide levels by either kissing or replenishing her can with more soda.

comedy supernatural ecchi