Then I'll Wait ( Kyojuro Rengoku x Demon Kamado Reader)

Chapter 7

"The Demon Slayer Corps has around several hundred members. It's an organization unrecognized by the government. Yet it's existed since ancient times, and we continue to hunt demons today. But as for who's leading the Demon Slayer Corps, that remains a mystery.

  Demons. Staple food... Humans! They kill humans and feed on them. No one knows when and where they first appeared. Their physical prowess is remarkable. Wounds heal in the blink of an eye. Flesh is restored after being hacked off, and limbs can be newly regenerated. Some demons can shape-shift. Others have otherworldly powers. They can only be killed by sunlight or by decapitation with a special sword.  The Demon Slayers battle the demons with their own mortal bodies. Since they're human, their wounds are slow to heal, and once lost, their limbs don't grow back! Even so, they battle the demons...to protect other humans" Urokodaki explain

Tanjiro look at him with wonder while registering the new information  his now master explain.

"I am a trainer. I literally train swordsmen. There are many trainers, and each of them trains their pupils with their own regimen in their location. To join the Demon Slayer Corps, you must survive the Final Selection process held on Mt. Fujikasane. Whether or not you're eligible for Final Selection is up to me"

After that Tanjiro start his training by descending the mountain while avoiding traps.

'Starting today, I'm going to keep a journal for Nezuko. I'm descending the mountain again today. I'm going to train my hardest so I won't die during Final Selection'

Tanjiro decided to wrote a journal since Nezuko hasn't woke up ever since they arrive. In case she wake up, she can read the journal on what happen when she's unconscious.

After repeatedly descending the mountain, day by day he's starting to learn how to avoid most of the traps. Though, something happen after a few days passed.

Y/N who is always waiting for Tanjiro inside the house everytime he finished his training for a whole day, now fall asleep and didn't wake up. He didn't think much about it since they are not normal anymore and their behavior change since they are demons.

Times passed and he's becoming stronger because he's even more adept at detecting scents than before. Even so... the traps are getting more and more difficult. There are times that Tanjiro think his master really want to kill him because Urokodaki throw four knives at him and he only barely dodge it in time. He even almost fall in the hole with sharp blades below.

'I made my descent today, sword in hand, but the sword really hampered my movement. With the sword, I can't stop getting ensnared in all the traps!' Tanjiro thought when suddenly, his leg got caught in the trap. He scream in fright as he hang upside down with his leg tied up with a rope. Urokodaki only look at him as he flail his arms in an attempt to get down.

"991! 992!" Tanjiro counts as he swing his sword.

Not just today.  He have been swinging the sword every single day. After descending the mountain, he swing his sword until his arms nearly fall off.

"1,000!" Tanjiro count finally

"500 more!" Urokodaki instruct making Tanjiro paled and felt like the soul left his body.

Next day, Urokodaki lectured him how to use the sword.

"Swords break easily. Though it's strong vertically, it's weak horizontally, so...you need to apply force straight along the blade"

Then Urokodaki give him a demonstration by slicing the bamboos infront of him.

"The blade's direction and the direction in which you apply the force must be exactly the same. If you ever damage the blade, in other words,  break it, I'll snap your bones, as well" Urokodaki threaten making Tanjiro sweat nervously.