Rising of the Shield Hero.
Naofumi Iwatani x Female OC

I’ve read it through now, and honestly? Pretty great so far! I’m looking forward to seeing more of this!

Ah, before I read the story, I feel like I should tell you that Gin and Byakuya became captains at the same time, so chronologically speaking, Gin was a captain well before our favorite lieutenants graduated, since Byakuya was a brand new captain when he took Rukia out