GenSane

GenSane is the familyship between Genya Shinazugawa and Sanemi Shinazugawa from the Demon Slayer fandom.

Backstory
Sanemi and Genya are brothers of a family of seven, after their father was killed by a mysterious assaillant, the brothers promised to themselves to protect their family.

Their promise was short lived and their entire family ended up being killed by their mother, who had been turned into a demon. By the time Sanemi got back to their house, all of their siblings had already been killed and Genya was about to be as well. Sanemi tackled the "wolf" (that was actually their mother) through the window to save Genya, telling him to run for it.

Genya ran to get the doctor for their injured siblings, but when he got out, he saw Sanemi standing over the corpse of their mother. Unknowing that his mother was the demon, or "wolf", Genya screamed at Sanemi and called him mom's murderer.

Genya recounted all of this before what he assumed to be his "death" by an upper moon demon. At the end of the memory, he thought of Sanemi smiling after they've promised to protect their family.

Demon Slayer Corps
Sanemi joined the Demon Slayer Corps so that his brother could have a normal life without fear of demons.

Fanon
GenSane initially started when they were revealed to be brothers in the manga, but the ship only started gaining popularity when their pasts were revealed and their motivations for joining the Demon Slayer Corps: eachother. Some fans ship GenSane as a romantic/platonic ship, but it is usually a bromance.

A semi-popular headcanon is that Sanemi's favorite food, ohagi, is a dish that Sanemi doesn't know how to make himself, but Genya does.

Fandom
FAN FICTION

TUMBLR

Trivia

 * Genya is taller than Sanemi, who's 5'10, making him exactly one centimeter shorter than him.