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In the not-too-distant future, Earth was attacked by mysterious beings and before long over a third of the world's population was destroyed. Even after bringing to bear its full, united military strength, humanity was unable to repel the assailants and forced into using weapons of mass destruction. This was successful, but the war and its conclusion resulted in the deaths of a crushing percentage of all fighting-aged males, and Antarctica being melted, causing much of the Earth's land to sink underwater. Years later, three young girls - Otoha, a headstrong country girl; Karen, a technical genius; and the highly-disciplined and strong-willed Eika - are being trained to pilot Sonic Divers, weapons being developed lest humanity be caught off-guard once again.
Kakeru Daichi is an openly perverted sixteen-year-old boy who has never had a girlfriend. One night, after a refreshing shower, the boy decides to have a drink and opens up a can of melon soda; but his first sip turns into his first kiss as the can suddenly transforms into a cute girl! After his initial hesitance to acknowledge her existence, Kakeru - as her new owner - names the girl Melon and allows her to stay. Melon, as it turns out, is part of a government project in which aluminium and steel 'Akikans' fight each other to determine which is the superior type of can. Completely against the idea, Kakeru insists that Melon will not fight. Though with the appearance of Budoko, a grape juice Akikan; and Yell, a sports-drink Akikan; it seems that they won’t be able to avoid the battles forever.
Asuna Harukaze is a girl who loves tennis to the point where she practices her swings with a pitchfork while working on the family farm. At school she is a member of the Soft Tennis Club along with the enthusiastic Kotone, food-crazy Chitose and bizarre yet talented Kurusu. With a big tournament approaching, the girls are taking practice more seriously than ever, but with Asuna’s strange and perverted logic surfacing at every turn and Chitose’s inability to win a single match, can the club emerge triumphant and make it to the nationals?
In a time filled with wars, environmental concerns and issues, there lives a gaggle of beautiful boys that are the personification of the world's countries. Japan, England, France, Finland, Germany and the rest of the boys attend the World Conference and tackle issues like global warming with a heavy dose of fun. Through multiple world wars the gang will traverse deserts, build mecha U-boats and solve the world's problems together!