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.

After the Silver Millennium was attacked by the Dark Kingdom, the three of them were drawn together. Setsuna’s Garnet Orb, Sailor Uranus’ Space Sword and Sailor Neptune’s Deep Aqua Mirror, had resonated that caused Sailor Saturn to awaken.

In the Infinity arc, Setsuna is introduced at the end of Act 30, as a student at K.O. University studying physics, who becomes friends with Reika Nishimura. Due to the previous events at the end of the Black Moon arc, she has no memory of being Sailor Pluto. Later, Setsuna falls victim to Tellu’s Tellun plant, and collapses on the ground, with Haruka and Michiru sensing that someone close to them is in danger. Setsuna calls for help, and a voice inside her commands for her to awaken, causing the symbol of Pluto to appear on her forehead. This also causes the symbols of Uranus and Neptune to appear on Haruka’s and Michiru’s foreheads, and the three appear in the same room together. In effect, she becomes Sailor Pluto again.

After the events of Mugen Academy, in act 38, after Sailor Moon and Sailor Saturn defeat the enemy, the trio started hearing a baby’s crying. Michiru picks the little baby in her arms and says that the three of them would now be the baby’s mothers, to which Setsuna agrees. Setsuna, Michiru, and Haruka then start living together to help raise baby Hotaru. In act 44, now Hotaru is a little girl, grown out and not a baby anymore. And she has been lovingly raised by her mothers. Michiru buys some flowers for Haruka to celebrate her sixth marriage anniversary. Then they go back home to Setsuna, who was avidly working until Hotaru starts crying. Setsuna tells Michiru about how much knowledge Hotaru seems to be acquiring, and fondly talks about how fast she's grown. Haruka smiles too and says that every day really is a dream for them to which Michiru agrees.

Fanon
It is not such a popular ship within the fandom. Most popular Sailor Moon ships are not polyamorous, but this one can be considered the most popular. Most fans of the ship see it as a friendship, considering the canon couple HaruMichi is part of it. Some fans find the polyship cute and headcanon the three of them raising Hotaru even until she was an adult something that could not happen in the original anime.

Fandom
FAN FICTION

Variations

 * HaruMichi — the ship between Haruka and Michiru
 * SetsuHaru — the ship between Setsuna and Haruka
 * SetsuMichi — the ship between Setsuna and Michiru
 * Outer Senshi — the friendship between Haruka, Michiru, Setsuna, and Hotaru