Ningen No Ane To Era Kokyu No ImoutoNingen no Ane to Era Kokyu no Imouto; Human and Gill-breathing Sister; 人間の姉とエラ呼吸の妹

「Ah, how honest and adorable. My dear Hime, even if you get thrown into the sea I definitely won’t let go…」 Why not take a peek into the bittersweet daily life of a pair of sisters?