Princess Jellyfish
海月姫 (original)
Amamizukan is an apartment complex where no boys are allowed. Tsukimi, a girl who adores jellyfish, lives there happily with her friends who all have nerdy obsessions of their own. Their peaceful lives gradually start to change when a beautiful woman helps Tsukimi out of a pinch. She stays overnight at the apartments—but it turns out "she" is really a "he".
Starring Takehito Koyasu, Mamiko Noto, Motoko Kumai, Akemi Okamura, Kana Hanazawa, Mitsuki Saiga, Kimiko Saito, Junichi Suwabe, Mugihito, Shigeru Chiba
It's a comedy and animation show, and has a rating of 7.7 out of 10 from Imdb which is usually fine for this kind of show.
Watch it here
Not found streaming from Sweden.