"Sway, Seven Colors"), was performed by Arcana Project,[11] while the first ending theme, "Tsukiumi no Yurikago" (月海の揺り籠, lit.

[4] Arcana Project also performed the second opening theme "Tomedonai Shiosai ni Bokutachi wa Nani o Utau darō ka" (とめどない潮騒に僕たちは何を歌うだろうか, lit.

"What We Sing in the Unstoppable Tide"), while Risa Aizawa from Dempagumi.inc performed the second ending theme "Shingetsu no Da Capo" (新月のダ・カーポ, lit.

In reviews of episodes 3–5, Clewis praised the magical realism of the series, how it "captures living in a rural part of Japan," is optimistic, the well-done story, and reads the cast as having "bits of queerness.

"[20][21][22] Christy Gibbs of CBR argued that the series "leans hard on themes such as environmentalism and sustainability," with the aquarium playing a big part in this narrative.