Inparusu's father, the "unnamed" main ex-leader of the purple fire rank, died at a fairly early age because of his smoking addiction. They couldn't replace the leader of the purple fire rank for a year because Inparusu (his first heir) was fighting lung cancer caused by secondhand smoke. He fortunately managed to get through it with access to experienced doctors from Earth (he's a demon who lives in Hell) and distancing himself from his father after being diagnosed with it. After his symptoms died down, Inparusu was able to lead the purple fire rank and train his little brother, his father's second heir.
His little brother, Hoka, is the result of a (what was supposed to be) one night hookup his father had with a human on Earth in Angia city. Since the mother had no support system and lost her job during her pregnancy, she wasn't financially able to care for Hoka. Inparusu wasn't exposed to secondhand smoke at the time, so his father saw no need for Hoka (because his only son wasn't literally DYING) and left him in an orphanage. But after Satan (the leader) found out about this, he was furious. When Inparusu was diagnosed with lung cancer, Satan immediately sent the unnamed leader of the purple fire rank back to Earth to search for Hoka. Hoka, however, felt uneasy around him, and, being experienced in running away (he ran away from the orphanage he was left in when he was six and ever since then committed crimes as "revenge" on Angia (but also to actually survive), and had to constantly run away from the police), always got away from him. Satan finally had enough of it after the leader died and went down to Earth himself, disguised as a normal Angian citizen passing by. He forced Hoka into Hell by manipulating Hoka's own fire (forcefully making him use it, despite Hoka's self promise to never use his fire again because of trauma) as well as the power of the black void given only to the main leaders of Hell.
Since Inparusu was unable to train his brother for a year and was constantly in and out of a hospital for six months, Hoka was left in the hands of the red fire ranks leader, Yokubo.
TW!!!!
Instead of training Hoka like Satan commanded her to, Yokubo chained him to a wooden pole in a room of red fire (red and purple fire doesnt harm him since he's a purple fire demon, a rank above red fire demons) and would 🍇 and sexually assault Hoka, using him for her own pleasure. In Hell, there aren't any morals, so it wasn't exactly "wrong" (it very much is wrong morally, just more normalized in Hell), but still seen as weird by demons outside of the Circle of Lust. Satan knew about Yokubo's actions, though he didn't know that she did it so often, and was under the impression that Yokubo was also training him. She was not. Satan also thought Hoka consented to it. He did not. Not that him consenting would matter, anyway, considering the fact that he was FOURTEEN. YEAH, FOURTEEN. I DONT THINK I HAVE TO ELABORATE. And Yokubo was already creeping on him when he was only twelve years old, which his dad would often scold her for.
Satan took Hoka away and when Hoka was in a better place with his older brother, Inparusu, who started sending him to therapy, and his four new friends, (Yokubo's daughter, I don't have a name for her yet), Kami, Shizu, and Raito (Raito later becomes Hoka's boyfriend), he shares what happened with Yokubo to Satan. Yokubo is severely punished by Satan, getting whipped with white fire (second hottest fire in Hell, only white fire demons and Satan can handle it), slashed in the face by Satan's long nails (or claws ig), and stabbed multiple times in the gut with his pointed arrow tail (and more). To put it simply, she was tortured. And as kinky as she is, she didnt find any sexual pleasure in it. The only reason she didn't die is because Satan is surprisingly best friends with a powerful angel who kept her alive (this angel soon fell because of the countless times they betrayed Heaven. For good reason, but still. Also, no, this isn't mocking Christianity, this is my own idea that's just inspired off of the religion... I don't agree with a few things in the Bible, sure, but I don't let that influence the bad things Heaven in this lore does. I make Heaven do those things because I want to send a message that you shouldn't blindly follow someone, not to mock any religion. I try to be as respectful as possible to everyone)
I'll make a rant later about Yokubo's relationship with her daughter. (I don't mean a romantic relationship, I just mean a mother-daughter relationship)
