Once there was this neglected child Tanuki shit. No one really seemed to like him because apparently they were jealous of his eyes. Like, what the fuck bro, calm the fuck down, their eyes. Everyone has them. Calm your Tanuki tits. But they didn't.
SO. Some guy was all like, "hey. You're nine. I'mma give you The Devil's Blade. You have power, you're gonna lead youkai." Tamazuki was all like "holy shit, okay-" he continued school as a normal human and stuff, making a youkai harem and gained a gay dog lover in the process.
He also killed all his brothers who opposed him because Tamazuki = genius. Clearly.
Then Tama was all like "I have enough youkai, yeah fuck this shit." So he made plans and some time later he went to fight this dude who he thought was just like him. Even though he isn't really. So. He went to go and confront him with a few harem members and gay dog lover.
Shit went down. A lot of shit. Many got killed because Tamazuki's fucking stupid yet we seem to love him.
Oh, he also killed gay lover dog which made the fandom kinda have a grudge against him but then he found some dog after the entire fuss which is probably Inugami but Tamazuki's just like "it's a dog. Not gonna spoil it." But he does anyway. He just doesn't know it.
Tamazuki's a secret tsundere.
Tama lost an arm and gained some large scar on his face because you don't fuck with Rikuo's harem. You also don't kill your own harem. But, you know, you wanna be an idiot, be an idiot.
Some other shit goes down but I can't really tell you what happened. Probably because I'm in the middle of the Shikoku arc in the manga and I've only finished the Shikoku arc in the anime. I've seen a lot of manga pages with Dassai and shit but that isn't the point.
At all.
In all conclusions, don't mess with Rikuo's harem. Don't kill your own harem. Stay in school and don't do drugs. Because Tamazuki was clearly on some good good during all this.