Akikan! is a light novel series developed by Riku Ranjo and illustrated by Hiro Suzuhira (known for his work on Shuffle! ). Its manga adaptation started from the October 18, 2008 in magazine Ultra Jump and its adaptation to anime began airing from 3 January 2009.
This anime romance, comedy and action mix. Everything starts when Kakeru Daichi, a high school student, decides to buy a soda from a vending machine melon without knowing that it would become a very cute yet weird girl that called Melon. For she knows more girls, one of them is Akikan (empty can) which survives only with carbon dioxide transmitted by a kiss. Melon and the other girls will have to fight each other but Kakeru oppose.