Everyone has a soulmate mark.

And yours was on your right shoulder a sideways diamond with the number 6 in japanese writing.

You're a soul reaper that's in the 11 squad... And you rarely get sent on missions so you just train on your Shikai and Bankai alone so no one gets burned by your Zanpakutō...

Right now you're talking to Renji Abarai the lieutenant of squad 6... When Byakuya Kuchiki the captain of squad 6 appeared out of nowhere which made you flinch a little.