The Tenth Pillar. (Kimetsu No Yaiba X OC)

Training

The sword shattered again. Hiiro was bleeding and sweating. How much time have passed? How many swords he had destroyed so far? His knees were at the verge of defeat, trembling like jelly, they could let the young shinigami fall at every second.

"C'mon, is that all you have?" The wildest captain taunted, he was no better than Hiiro. He had cuts all over his body, yet he was enjoying the fight. That was the way Zaraki Kenpachi enjoyed his life. "Get up, kid. You can still fight, right?"

"My, my. Kenpachi-San. You should give him a break." Kyoraku interrupted, he took another sip of his sake and after a few seconds of degustation, he swallowed. He stood up slowly and walked forward the violent captain "You are in no good shape either. You should go to see Unohana captain."

"Huh? Are you telling me to run away?" Soon, Kenpachi could tell the real intentions of the usually calm captain. But now, there was no sign of that man. "Fine. Don't take him lightly."

The ones in charge of the training today were Byakuya Kuchiki, Kenpachi and the pink haori captain.

The former captain of the twelfth squadron agreed to let them use their secret training grounds, as soon as they arrived, Hiiro materialized his Zanpakuto.

The training was harsh, but he could do it. He needs to find the real Zangetsu, there were hundreds of different swords, even with that, there was only one amongst them who is the authentic Zanpakuto.

"Are you ready, Hiiro-chan?" The eight squadron captain released his dual swords. He didn't thought about holding back, this idea never crossed his mind. Not once.

The night pillar smiled, his heart was pumping, his body was screaming. Trembling and panting, he reached for another sword.

A big, no, a gigantic one, an oversized, black Khyber knife, almost as tall as him with a cloth-wrapped tang instead of a proper hilt.

"Come." A sadistic smile grew on his face. He didn't knew why, but he was enjoying this battles.

"Awwww, man. Kyoraku-sensei is ruthless." Hiiro whispered as he left his weight fell to the tatami floor. The days were no more for him, he only knew training when it's dark and training when it's not dark.

At least he had a break once in a while, he could go to see Unohana captain to treat the heavy wounds he had.

Fighting with the strongest swordsmen of the Gotei 13 was no easy task.

"I wonder if Kurotsuchi-sensei has the formula by now..."

The mad scientist was happy when you gave him that flask. Like a boy with a new toy. Kuchiki Byakuya was sitting in front of the table, in fact, they were resting at the Kuchiki clan manor.

He happily accepted him in there, even of he didn't show any emotion, the head of the clan was glad to have his apprentice back.

"Well, that's his nature. He likes to study everything or anyone. Even though that's not right all the time." The night pillar laughed nervously.

They talked about the time apart. Hiiro happily narrated the story about his adventures with the demon slayers.

He proudly spoke about his three apprentices, he sadly remembered the grave of Kanae Kocho and told his master about the death of his friend, the flame pillar: Kyojuro Rengoku.

He went from his fights to his good memories with everyone, he tried to act the fight with Upper Moon one, and even he described Shinobu and Mitsuri with glimmering eyes.

"I see, Kocho Shinobu and Kanroji Mitsuri." The jet black haired shinigami inquired as his cold eyes met with the golden eyes of his disciple. "You have to bring them here. We are going to be happy to meet the two girls."