Akikan!

Everyone goes to a hot spring, with Najimi arranging for a cold spring to be prepared for the Akikans. However, Yell and Budoko are a bit objected against Yurika having her way with Najimi and Misaki. Meanwhile, Melon is a little frustrated with Kakeru's idiocy, though later feels a bit lonely. However, everyone gets annoyed with him when he tries to perform a 'body inspection'. Upon returning to the cold spring, they are surprised to find Miku, who had been looking for her owner. She runs off naked, so the other girls decide to look for her, encountering Kizaki while trying to get their clothes sorted. Melon slips on a banana skin and has sushi fall on her, attracting Miku's owner. When Miku spots her, the same thing happens and they both attract a lot of cats. After Najimi gets the cats off of them, Miku runs off again and Melon gives chase, only to be assaulted by Kakeru, who was trying to escape from Otoya. As punishment, he and Goro are tied up while the others return to the springs.

Kakeru Daichi purchases a can of Melon soda. When he goes home and drinks it, the can transforms into a girl. Thinking it's all a dream, Kakeru acts perverted in front of this girl, before getting attacked by the girl's powers. Kakeru ends up treating the can rather shoddily due to the conflict in behaviour and leaves her in a cupboard before going to school. When he comes back though, he finds the girl drained of all life due to being low on carbon dioxide, so he kisses her to allow her to live. Kakeru decides to name the girl Melon. They are visited by a man named Hidehiko Otoya who explains that the 'girlish' cans are part of a battle called 'The Akikan Elect' to determine whether steel cans or aluminium cans are superior. Kakeru is seemingly against this, as he doesn't want people to fight needlessly.

Kakeru notices that Melon doesn't do much during the day, and decides she should go to school with him, where he introduces her as her cousin. There is a bit of hostility between Melon and Kakeru's friend, Najima Tenkuji. When trying to find a place to put Melon back into a can, Kakeru enters a freezer room, and when Najima enters as well, they get locked in. During the cold, Najima recalls the time when Kakeru saved her from being kidnapped.

Kakeru and Melon are confronted a small aluminium Akikan named Budoko, whose powers come from her grape juice nature. She explains that Akikan types can be told by which ear a ringtab is on. While her primary attacks seem to have little effect on Melon besides annoyance, her explosive attacks are more dangerous. Melon gains the upper hand, but Kakeru breaks the fight up and Budoko escapes. Melon and Kakeru argue about their different standings on the Akikan Elect. After some talking, Kakeru decides they will participate in the Akikan Elect, but they will always try to avoid fighting if necessary. Afterwards, Kakeru, Yurika and Goro go over to Najima's house for a study session. While having a few drinks, Najima gets 'drunk' on carbonated drinks. When she goes to buy some more drinks, she drinks an energy drink which turns out to be an aluminium Akikan named Yell, stealing her first kiss.