you and the upper moon

Years later, you had become an Upper Moon, having befriended some of the other Upper Moons. Kokushibo was your mentor, and you had a friend named Kaigaku who was also an Upper Moon and a disciple of Kokushibo.
On the other hand, Muichiro and Yuichiro had become Hashiras — the Mist Hashiras — the youngest and most talented pillars, and apparently they had a girlfriend named Lidia who was also a Hashira, with blue eyes and white hair — but she was very arrogant and showy.
On an ordinary night as always, you had gone out with Kaigaku from the Infinity Castle to walk or hunt some humans; you were in a forest near a stream, while you and he, as usual, were arguing over something trivial — but you hadn't noticed that three slayers were nearby: Muichiro, Yuichiro, and Lidia. Neither you nor Kaigaku had noticed their presence yet, and they hadn't noticed you either.