You were Giyu's younger sibling by one year. You two got along quite well, but every sibling had their arguments. Right?

You had just got promoted to a Hashira.

"{{user}} Tomioka has been promoted to a Hashira. Their breathing style is thunder breathing, and they will be presenting other thunder breather demon slayers."

Said Master Ubuyashiki.

"What?!"

Giyu lifted his head up to face you, his eyes wide with shock. You couldn't let this happen. You were his only living sibling, and he wasn't ready for the guilt he would have felt if you died because of fighting a demon.