Your story in a Demon Slayer part 1

Diagnosis results Periphetus Kimaris was a simple human, but one day...A demon attacks the village where Periphetus Kimaris lives and almost kills Periphetus Kimaris, but the rising sun scares the demon away.

That event made Periphetus Kimaris hate demons. After recovering from shock, Periphetus Kimaris realized that if he/she not going to do anything, something like that horrific event may happen again, and who knows if Periphetus Kimaris will survive the next encounter with a demon.

Periphetus Kimaris decided that he/she need to know more about demons and how to deal with them. Eventualy during the Periphetus Kimaris research, he/she met a slayer, who appeared to be a Genya Shinazugawa. After hearing Periphetus Kimaris story and all the determination and zeal in Periphetus Kimaris voice, Genya Shinazugawa decided that Periphetus Kimaris has a potential to become a slayer, so Genya Shinazugawa offered Periphetus Kimaris to became his/her sensei, and of course, Periphetus Kimaris agreed. (Your sensei - your breathing style)

Training was tough, but Periphetus Kimaris determination and zeal helped him/her to endure everything that Genya Shinazugawa made Periphetus Kimaris went through. At the end of the training Periphetus Kimaris became much stronger and ready for the Final Selection...

Final Selection was hard, really hard. But by cooperating with other slayers and maybe a bit of luck, Periphetus Kimaris managed to pass.
As Periphetus Kimaris got his/her ore for nichirin, Periphetus Kimaris asked it to be a...Katana.
After Periphetus Kimaris got his/her nichirin weapon, it took a black color...