Many Time Skip
---10 Days Later---
Since I have been brought into this world, what I did is immediately trained myself. Knowing that this world will be a strength-based society that reveres heroes, I started to prepare myself.
Doing some basic training to strengthen myself and my body, like doing some push-ups, squats, weight-lifting stamina, endurance training, and many more.
And since I have Yoriichi's godlike body, I can already see the progress happening inside my body, though it was only a slight improvement, it was already considered a Big improvement considering the small time frame I have since I started to train.
The house that ROB has given me has everything necessary for me to survive, even highly nutritious food that helped me increase my body strength more.
---1 month later---
Life was very monotonous for me here. I didn't do anything for the past month but
to train and train.
This was my schedule.
1. Eat in the morning.
2. Train My body.
3. Train with my sword.
4. Eat lunch.
5 . Train my lung capacity.
6. Train.
7. Eat dinner.
8. Sleep.
And repeat.
That was all it is for me to do.
Though very boring schedule still, the progress is amazing.
---1 month later---
Training.
---
---1 month Later---
Training.
----
---1 Month Later.---
Still training.
---
Month by month the extreme excitement inside me grew bigger and bigger as the thought of being able to do things considered impossible back in my previous life continues to stimulate my body.
And furthermore due to my body being Yoriichi's godlike body the result was very outstanding and amazing that it stimulated me more.
.
.
.
---1 month later.
Pheww. finally, I thought that my quirk wouldn't come out.
Finally, I have awakened my quirk.
A bit vague on the detail but still it was there though it was only a sword for now.
During training when I was practicing my lung capacity I accidentally activated my quirk.
What my quirk do is when I will it a sword magically manifest in my hand.
I haven't yet decided what breathing should I learn first.
I mean there are a lot of choices, 14 actually. Each of them is good and fantastic and amazing but I'm still considering what to pick.
And I don't even know how to awaken it.
---just weeks later---
When my excitement reached it's peaked the image of fire was printed in my mid as I theorize that to chose my element I must will it or imagine it in my mind.
And finally, Turns out it was true all I have to do is just imagine the element I want in my mind and Boom my sword would change depending on the element and it would carry the effect of it.
Like when I imagine the image of fire inside my mind, the sword that appeared out of thin air changed into a sword similar to the one Rengoku used furthermore a slight heat enveloped it, meaning that it was of the fire element.
Though I can only use 1 breathing technique, for now, it was still progress.
---General Pov---
Amid the forest, a handsome young boy stood there.
He has a calm yet serious look on his face, and his demeanor blends with his surrounding as his presence gives on a flamy aura.
That boy was Yoriichi.
Yoriichi wore a red haori over a very pale orange-colored nagagi kimono with a black umanori-styled hakama, a pair of zori with red straps, and white tabi socks.
long and spiky hair with red tips that he kept in a ponytail.
He was holding a katana with flame patterns on it, its handguard resembling that of a burning flame, perfectly complimenting the flaming aura that he was currently emanating
He then took a deep breath and hold the sword tighter in his hand. His gaze focused on the giant log that he chopped up and placed it away from the forest to prevent forest fire. The log was standing tall planted in the ground as it's height reached about 7 meters tall and it was about 10 meters away from him.
He then exhaled.
[Breath of Flames: First Form, Unknowing Fire]
His figure dashed as he leaves on a trail of fire on his track. He was fast but not at the speed of something that would be considered super fast, the only thing that makes it amazing is the fire trail that it leaves behind.
[Breath of Flames: Second Form, Rising Scorching Sun]
Upon stopping on his dash he then slashed his flamed-patterned katana upward, his upward slash generated a weak-looking fire, that looks like a crescent moon.
His slash split the tree in half as it then got burned in flames.
He stopped and fell to the ground, breathing heavily as he was gasping for air.
"Huff, Huff, Huff I see I can only use two forms for now."
Currently, Yoriichi can only use two forms of flame breathing, his body is strong but not enough to hold the technique of Flame breathing that is enhanced by his quirk.
Normally if his sword technique doesn't generate real flame then he can perfectly perform all of the forms of it but since his sword technique creates real and destructive flame it has become harder to use and perform.
So in actuality, this was more difficult than the original technique of the Demon Slayer world.