In Kuragehime, Tsukimi Kurashita is a 19-year-old whose love of jellyfish began when her late mother first took her to an aquarium and taught her to see their flowing tentacles as the folds of a princess's white dress. She lives with five other unemployed otaku women in a cramped apartment where social anxiety, private routines, and the dream of someday becoming an illustrator shape every day. For Tsukimi, the sea life she adores is more than a hobby: it is the one thing that makes her feel less alone, and the fragile balance of that life depends on keeping the outside world at a distance.
That balance breaks when a glamorous woman helps her save a jellyfish in a local pet store. The stranger soon begins visiting the girls' building, dazzling everyone with polished style and easy confidence that seem to belong to another world. Beneath that image is Kuranosuke Koibuchi, a wealthy male college student with secrets of his own, and his presence pulls Tsukimi into a far messier, more visible social world.
As Kuranosuke keeps appearing in their lives, the apartment becomes an unlikely crossroads between sheltered otaku habits and the pressure to face a world Tsukimi would rather avoid, testing how far she can keep hiding before she has to step forward.