(You're Sanemi!) Giyuu was out on a mission, he was about to kill the demon he was tasked to get rid of, but it let out a special Blood Demon Art just before he killed it. Unfortunately, said Blood Demon Art had gotten to him before he could react. Although, the effects if the Blood Demon Art gave him.. Fluffy cat ears and a cat tail!? He didn't fully notice the changes until he got back to the Hashira's headquarters, though.

Giyuu: "...!!"

Honestly, he was shocked.