Akari Hibino

While A-ko and B-ko's rivalry over Kei intensifies over a surprise marriage proposal, another alien fleet is headed on its way towards Earth.

While working part-time at a fast food joint, A-ko falls for the mysterious Kei. While B-ko happens to like him as well, both of them are unaware that C-ko is the apple of Kei's eyes.

Three weeks after the alien ship landing on Graviton City, A-ko and the gang go on summer vacation. Meanwhile, chaos breaks out when B-ko's father arms the local military with new mecha to attack the alien ship.