https://mangadec.com/imgs?src=/publish/manga-info?editId=673a48885c78f0b4ed8d3607,https://mangadec.com/imgs?src=https://s01.mpujj.org/media/ampi/6b3/6b3da5d0db2249ff8e394e425579ba02fee857b3_225_322_110092.jpeg,https://mangadec.com/imgs?src=1731872767645,https://mangadec.com/imgs?src=学園潜水艦隊マーメイドガールズ,https://mangadec.com/imgs?src=Fukami Makoto,https://mangadec.com/imgs?src=action,https://mangadec.com/imgs?src=seinen,https://mangadec.com/imgs?src=ongoing,https://mangadec.com/imgs?src=e1,https://mangadec.com/imgs?src=e2,https://mangadec.com/imgs?src=e3,https://mangadec.com/imgs?src=e4,https://mangadec.com/imgs?src=e5,https://mangadec.com/imgs?src=e6,https://mangadec.com/imgs?src=e7,https://mangadec.com/imgs?src=e8,https://mangadec.com/imgs?src=e9,https://mangadec.com/imgs?src=wish,https://mangadec.com/imgs?src=2,https://mangadec.com/imgs?src=doing,https://mangadec.com/imgs?src=completed,https://mangadec.com/imgs?src=on_hold,https://mangadec.com/imgs?src=dropped,https://mangadec.com/imgs?src=repeat,https://mangadec.com/imgs?src=d000,https://mangadec.com/imgs?src=375,https://mangadec.com/imgs?src=3,https://mangadec.com/imgs?src=gakuen-sensuikan-tai-mermaid-girls,https://mangadec.com/imgs?src=In the manga's story,https://mangadec.com/imgs?src= extra-terrestrial life known as Trench Walkers reveal themselves,https://mangadec.com/imgs?src= emerging from the Antarctic,https://mangadec.com/imgs?src= and walking on the sea floor. Their goal is to terraform the Earth to their liking,https://mangadec.com/imgs?src= which involves raising the sea level by 70 meters,https://mangadec.com/imgs?src= thus rendering Tokyo and many other population centers uninhabitable. They have also begun to change Earth's surface water into what they call Nectar,https://mangadec.com/imgs?src= the \divine water.\ Those who are incompatible with Nectar have a high chance of death when imbibing it. However,https://mangadec.com/imgs?src= there are girls who are found to be compatible with Nectar,https://mangadec.com/imgs?src= and they are recruited to be marines in a fight against the Trench Walkers,https://mangadec.com/imgs?src= boarding ships to do battle in a new deep sea front line. The story centers on Hiro Todoroki,https://mangadec.com/imgs?src= who receives a message from an older sister,https://mangadec.com/imgs?src= a marine supposedly missing in action. The message tells Hiro to find a formidable marine named Kiriri Tsunoba. 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