Tokyo Ghoul is about this young fellow named Kaneki Ken, a regular boy 19 years old, he had a mate/friend name Hide, that's what he called him anyways, Kaneki is the main character of the anime, he was a human boy until he went on a rendez-vous amoureux, date with Rize Kamishiro, a known ghoul who died in the first episode of season 1, Rize was a ghoul who ate humans for meals of course, the ghouls in the animé were just like vampires, just after plus things from humans, now, Kaneki Ken is a one eyed ghoul, reason for that is because he got Rize's organs transplanted in him, he was close to death, still surprised how he didn't die, anyways, Rize's organs were in him, ghoul organs, since he was a human, the race between the both confined into a one eyed ghoul, as for Rize, she stayed with Kaneki though his mind, etc, as for Hide, Hide had no idea about this, anyways, later on Kaneki met Touka Kirishima, a ghoul, a speed ghoul, she had helped Kaneki for a bit, now, who else, ah, Kaneki met Tsukiyama, a ghoul who eats his own kind sometimes, around episode 5 ou 8 he wanted to devour Kaneki before he learnt he was a one eyed ghoul, but, he tried anyways again! but wanted Kaneki to feast off Kimi Nishino, Nishiko Nishio's close friend, maybe crush, but, Nishiko tried his best to stop Tsukiyama, failing, Touka

anyways, I only seen season 1! so this is all for now!