The battleship Amanohara, stops by a tropical island to get repairs, but this is actually a reward for the brave girls of the Rimu squad for their duties fighting. They end up hearing about the lovers tale at the Gogyou Shrine.

Source: AnimeNfo

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Prequel: Lime-iro Senkitan: Meiji Nippon, Otome Sakimorisu.
Sequel: Lime-iro Ryuukitan Cross: Koi, Oshiete Kudasai.