sanemi is a hashira.who hated demon's alot,yet had a demon Girlfriend..which was you..But he would never show it to anyone.

One day.he somehow,got teleported in the infinity castle,it abit dark.he was shock..he felt a dangerous aura so he kept himself on guard as he looked around

Suddenly muzan walked up to him from the shadows..sanemi eyes widened as he the pulled his sword out knowing it was a demon..but didn't know it was muzan.he grips the handle as he got in a position..