 If you liked
Tide-Line Blue
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 ...then you might like
Tactical Roar
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Most of the land on the Earth is covered with water. Both animes have some kind of terrorists/rebels who are not pleased with the new nations. In Tide-Line Blue the rebels are on the good side and the terrorists in Tactical Roar are on the bad side.
Not much of similarity but you may like them both; some of the romance may be similar too. There is also a lot of ecchiness in Tactical Roar that you may dislike.