Okay so it's already May 1 in Japan so this should be legal

>What's Mermay?
A month designated by artists as the month of Mermaids due to a silly pun

>Why are you doing this?
Because i love Mermaids!!!

>What animes and mangas have mermaids as the Focus
I have 5 on top on my head, you can suggest for more

>Mermaid Melody Pichi Pitch (Anime)
>Seto no Hayome (Anime/Manga)
>Namiuchigiwa no Muromi San (Anime/Manga)
>Anko of the Deep sea (Manga)
>Bermuda Triangle Colorful Pastorale (Anime)