They’re All Sweet & Bubbly Inside… Until It’s Time to Kick Each Other’s Cans! Hobbies are often a great way of meeting new people, but how could Kakeru Diachi, who collects rare juice cans, have ever suspected that he’d meet a fascinating new girl when he attempted to DRINK her? Naming her Melon, because she’s got great melon… soda, Kakeru quickly learns that she’s an Akikan - a beautiful girl who’s also a special can created to fight other Akikans in a strange experiment to determine what kind of container is better: steel or aluminum! Will becoming involved in this ridiculously twisted research project gone awry complicate Kakeru’s life incredibly? Of course it will, but because Melon’s steel body needs carbon dioxide to breathe, he’s now stuck with her since she’s too CO2 dependent! And when his wealthy, attractive, best childhood friend Najimi gets HER own aluminum Akikan, the trouble really begins! For once, it’s not what’s inside that counts as battling beverage containers run wild in Akikan!
Pacisfist Kakeru Daichi gets more than he paid for when the soda he bought magically transforms into a girl. She’s a warrior in ‘The Akikan Elect’, a battle for superiority between steel and aluminum cans.
At school, Kakeru tries to pass Melon off as his cousin. His friend Najima doesn’t take very kindly to the new girl, and a sticky situation leads her to realize some things about Kakeru.
After a run-in with an aluminum Akikan, Kakeru and Melon find a compromise regarding ‘The Akikan Elect’. Later, another Akikan causes trouble during a study session at Najima’s house.
Yell finds herself abandoned when a drunken Najima goes in search of Kakeru. Later Otoya and Kizaki explain Akikans to Najima, and she reaches an understanding with Yell.
Najima cancels her date with Kakeru after figuring out the truth about Melon. Somehow she continues to get the wrong idea about their relationship.
Kakeru struggles to help maintain peace between Yell and Melon. Najima is unsure how to resolve the hostility between their Akikans.
It turns out that Akikans are so terrible at baseball that Kakeru realizes he needs to figure out a way to stay in touch with Melon if she gets lost. Yukira has had it with Yell.
Kakeru and Najima finally have their date, but Yell is determined to ruin it…and Melon is determined to stop her. Goro and Yukira tail them as well but have a run-in with Otoya and Kizaki.
Melon gets a job at a maid café which leads to Yell getting a secret job. Kakeru and Najima find the true reasons their Akikans were looking for work.
What do Melon, Budoko and Yell do when their owners aren’t around? Why, they do laundry, clip coupons and get in altercations with cats, of course!
A mysterious and powerful new Akikan attacks each of the known Akikans one-by-one. In the end, will the humans be able to take down this powerful intruder?
The humans recover their Akikans from the Mixed Juice Akikan. With their recovered Akikans, the humans are able to confront the Mixed Juice Akikan in battle.
Najima arranges for the gang to take a trip a hot spring, with the Akikans in tow. Kakeru ends up upsetting everyone and Miku is on the hunt for her owner.