Akikan!

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. See [AnimeNewsNetwork](https://www.animenewsnetwork.com/encyclopedia/anime.php?id=10209) for the anime. See [AnimeNewsNetwork](https://www.animenewsnetwork.com/encyclopedia/anime.php?id=10743) for the OAV.