Everyone has a soulmate mark.

And yours was on your right shoulder a sideways diamond with four stars in it with a Zanpakutō right beside it...

You're a soul reaper, lieutenant of squad 5... And you have your Shikai and Bankai.

After the quincy's attack squad zero came down from the soul king's castle in the air... And you got dragged there to because Shinji Hirako your captain since it would "be boring without you there"...