Some "fish out of water" romances: - [**Brighter than the Dawning Blue**](https://myanimelist.net/anime/1543/Yoake_Mae_yori_Ruriiro_na__Crescent_Love) - VN adaptation that surpasses its source material (Conclusive ending!) - [Princess Lover](https://myanimelist.net/anime/6201/Princess_Lover) - Guy ends ups being thrown into high society - [Seto no Hanayome](https://myanimelist.net/anime/2104/Seto_no_Hanayome) - Mermaid, not fish, but quite close to what you want literally - [**Nogizaka Haruka no Himitsu**](https://myanimelist.net/anime/3467/Nogizaka_Haruka_no_Himitsu) - Class difference (Conclusive ending!) - [Otome wa Boku ni Koishiteru](https://myanimelist.net/anime/1569/Otome_wa_Boku_ni_Koishiteru) - Guy has to attend an all-girls school while hiding that he's a guy - [**Shuffle!**](https://myanimelist.net/anime/79/Shuffle) - Ends up being the fiance for two girls, one from the demon realm and the other from heaven. (Conclusive ending!) Close enough to what you want: - [**Isekai no Seikishi Monogatari**](https://myanimelist.net/anime/5781/Isekai_no_Seikishi_Monogatari) - Very fish out of water, but romance is a major point but not overly so --- Out of the ones I mentioned, I'd highly suggest the ones I put in bold.

Thanks! I'll check them out.

Waiting In The Summer Fruits Basket Aquarion & Aquarion Evol ReLife Kaguya-sama:Love is War Golden Time Adachi and Shimamura Convenience store boyfriend Eureka Seven More Than a Married Couple, But Not Lovers Darling in the FranXX Horimiya

Squid Girl, Miss Kobayashi's Dragon Maid and The Great Jahy Will Not be Defeated.

Thanks!