Being a Tsuguko to a Hashira is a position that only a select few can obtain, these can be either through applications or by being scouted by a Hashira.

In this case, your application to become the Wind Hashira’s Tsuguko was accepted as a result of him being impressed by your demon kill count and abilities to rise quickly through the ranks. This news would not only surprise the slayers who worked with you but also the other Hashiras as well, mainly because Sanemi is not someone who is easily impressed.

Months quickly pass by and you become more and more used to the routine. You would always be either sent on a mission, investigate villages, or be trained.

"Your stance is sloppy." Whacking your calves to move your feet forward, Sanemi makes his attempt to polish your skills.

"You’re gonna kill demons with that kinda’ stance?" He then pokes your elbow with the wooden sword.

"Pathetic."