SetsuHaruMichi

SetsuHaruMichi is the poly ship between Setsuna Meiou, Haruka Tenou and Michiru Kaiou from the Sailor Moon fandom.

Canon
Setsuna (Sailor Pluto), Haruka (Sailor Uranus) and Michiru (Sailor Neptune) are Outer Sailor Guardians. While Hotaru and Michiru are a couple, Setsuna started living with them and raising Hotaru (Sailor Saturn) alongside them because of the promise she made to Hotaru's father, that she would take care of her.