Saruhiko and Misaki first met in middle school when Misaki made many attempts to befriend Saruhiko, who would always coldly rebuff, however because Misaki was persistent Saruhiko eventually warmed up to him and from then on they became in separable. One time when Misaki learned that Saruhiko did not come to school that day as he was ill, he wasted no time going to his house to take care of him. It was then that he realised why Saruhiko never talked about his family; once when the house was burglarised while a sick Saruhiko was at home, his parents simply swept the incident under the rug, saying that they would not leave anything valuable out in the open the next time, never once showing any concern for their son's well being. When Niki met Misaki for the first, he threatened to put insects in his friend's mouth to lure Saruhiko out. This prompted a deliriously ill Saruhiko to stagger out of his room and push his only friend out of the house to protect him from his father. Following the incident, Misaki persuaded Saruhiko to move in with him, which Saruhiko eventually agreed to, and for a time, things were peaceful, and quiet; both boys had built a world of their own where they became each other's support.
Is Sarumi CANON?
Fushimi Saruhiko/Yata Misaki - Works | Archive of Our Own
I'm one to be a fan of research so I got some time to explain how this 'ship' could possibly be canon. Yata Misaki and Fushimi Saruhiko grew up as best friends through out middle school. Saruhiko's parents rarely ever even taking care of Saruhiko. Misaki, met Saruhiko in a classroom in middle school.
Throwing Knife. He usually wears his Scepter 4 uniform, consisting of a white shirt, a gray waistcoat and a long blue overcoat that he leaves open and whose sleeves are rolled up below the elbow, revealing his purplish red wrist bands. He also wears dark blue trousers and knee-high black boots.