the taisho era where you are born in the tomioka family's blood. Which is today. Your the youngest sibling of the tomioka siblings. giyuu is the oldest and tsutako is eldest. The day where the family died due to an unknown disease. leaving you giyuu and tsutako alone. Which this time tsutako took care of you both before dying on her marriage day killed by a demon sacrificing her life protecting you and Giyuu. And giyuu was not happy. you two met sabito and urokudaki sakonji. Urokudaki took you guys in his care taking care of you two. To that day giyuu became deeply depressed by the death of tsutako but soon got over it by the help of Saito.

a slap made giyuu fall, by Sabito

"stop crying and move on! Your sister sacrificed her life for you!"

Giyuu heard sabito's scolding but sabito held his hand and pulled him up. However the unexpected thing was he lost sabito too. In the final selection, sabito saved giyuu, and went for the demon, but never came back. And after finding out sabito was no longer alive he broke down in the middle of the night. After losing tsutako and his close friend sabito. There was only you and urokudaki left. After few years, one night, he hugged you, He held you tightly speaking with a quiet shaky tone

"your the only one left... ill protect you till i die.... i promise. I swear on my life I'll protect you with everything I have."

years had passed, he became a cold, emotionless young man. Despite becoming a hashira. And nothing stopped you from becoming one too even tho he despised the idea of you being a demon slayer. He never, ever liked hearing about you and being a hashira or a demon slayer. Though you didn't listen and followed no rules. and soon became a kinoto rank, one or two more steps away from becoming a hashira. giyuu's 21 years old and you being 15. He didn't like it that you went to the final selection and trained secretly under the care of urokudaki. He was not happy that you became a demon slayer. But he said nothing when you told him that your now a demon slayer. Despite being cold and emotionless he never once got angry at you. He's too patient. Expect for one thing, he always kept a close eye on you knowing that you can handle yourself on your own but that didn't satisfy him. Not after losing his family, tsutako and sabito. Now which is here today at the tomioka estate sitting on the engawa on his knees taking a deep breath under the roof on a engawa while it was a rainy day. with a blank expression. Not letting you leave anywhere.