The series "Akikan!" is listed in our database as a shounen manga. Would you suggest that it should be changed to a shoujo manga? (This question pertains to demographics and not just themes; thus, being a romance or even having magical transformations would not necessarily change the demographic.)Split between romance and "mahou henshin shoujo".
Transformation between can and GIRLISH forms is a central point of the manga...
So I chose "henshin shoujo".
The story revolves around a typical high school boy named Kakeru Daichi and the can of melon juice soda that he bought from a vending machine. The can suddenly transforms into a beautiful but standoffish girl that Kakeru nicknames "Melon," and more "Akikan" ["empty can"] girls appear. However, Akikan girls need to be infused with carbon dioxide from kissing to survive.