If you're looking for anime similar to K: Return of Kings, you might like these titles.
Looking for a change, Mikado moves from the countryside to bustling Ikebukuro to attend the same high school as his best friend, Masaomi. Though navigating a new school and friendships can prove tough by itself, Mikado also finds an overwhelming number of new delights and dangers in the district he now calls home. From a friendly Russian sushi bar to the violent color gangs, to even an urban legend in the form of a black motorcycle rider, each resident of Ikebukuro is unique and frightening. But the town is smaller than it seems at first, and these strange events appear to be connected. Will the growing storm sweep up the transplanted country boy and his friends or will Mikado find himself at the center of a dramatic change for Tokyo?
The green clan in K reminds me a lot of the Dollars from Drrr. Just about anyone can join with the use of the internet and the leader is sort of in the air; no one knows much. They are all connected by a cellular device and chatrooms.
Other than that, both shows have supernatural elements. Drrr has color gangs and K has color clans; and they don't exactly get along. Also, Kusanagi from K sort of reminds me of Heiwajima from Drr and Fushimi reminds me a little of Orihara.
Neither anime focuses as much on one character or group like your typical story. Both bounce around and therefor made me feel like I only half understood anyone. However, K has more single character or group focus than Drrr. K has a more defined singular main character.....even if he doesn't do much.
Also, both anime seem to be a bit overhyped imo.
Anyway....biggest differences: more fanservice in K, more explanations in Drrr, and Drrr has better visual quality and more average or normal visual style than K. K also focuses more on the superpowers I guess.
But mainly.....the green clan just reminds me a lot of the Dollars. As soon as they explained the structure of the Green Clan I was like "it's the superpowered Dollars".....sort of.
Kicked out of his orphanage and on the verge of starving to death, Nakajima Atsushi meets some strange men. One of them, Dazai Osamu, is a suicidal man attempting to drown himself in broad daylight. The other, bespectacled Kunikida Doppo, nervously stands by flipping through a notepad. Both are members of the "Armed Detective Agency" said to solve incidents that even the military and police won't touch. Atsushi ends up accompanying them on a mission to eliminate a man-eating tiger that's been terrorizing the population... In the virtual city of Yokohama are individuals bearing the name of Bungo, "literary masters," who possess unusual powers likened to that name. Now begins the battle between the mysterious Bungo powers!
Bloodthirsty demons lurk in the woods, and nobody dares to venture out at night, save for the demon slayer of legend. Surviving in this harsh world, young Tanjirou takes it upon himself to protect his family–until the day that everything is taken from him in a vicious slaughter. Now, all he has left is his sister, and she’s not even human anymore.
As I said in the previous K season , in the recommendations:
Both animes are about supernatural and action .
In Kimetsu no Yaiba the main protagonist is gentle and in the beginning is weak but in time he becomes stronger and stronger , he also fights to protect his little sister and joins a group . The same goes for K , the main protagonist is gentle , and in the beginning he might be weak and vulnerable but becomes strong , he also fights to protect those who he cares about , his friends and the innocent people in the school he lives . Both animes have amazing fights and mysteries to be solved . Both masterpieces .
That is everyone's wish. Here in a world where science has solved all questions. This story is set in Oshima. The happy, carefree 14 year old Akane Isshiki lived a poor, but well loved life together with her reliable little sister, Momo, who does all the housework, and her grandfather, Kenjirou, a genius inventor who only created useless devices. When the weather is clear, they can see the artificial island, Blue Island, across the sea. In the center of that island rises the revolutionary Manifestation Engine, a discovery that solved the world's energy problems.
What if superhumans were real? Even better, what if every fabled superhuman existed at the same time, in the same place? Titans from outer space, life forms from a mystical world, phantoms and goblins from ancient times, cyborgs created by scientists, relics that rose out of the ruins of ancient civilizations. In another Japan, it's not just a question of “what if”—it's a reality. Some of the superhumans choose to keep their identities a secret, while others bask in their superhuman fame. Jiro Hitoyoshi, member of the Superhuman Bureau, keeps track of their doings.
Titans from outer space, life forms from a mystical world, phantoms and goblins from ancient times, cyborgs created by scientists, relics that rose out of the ruins of ancient civilizations. In another Japan, it's not just a question of “what if”—it's a reality. Some of the superhumans choose to keep their identities a secret, while others bask in their superhuman fame. Jirou Hitoyoshi, member of the Superhuman Bureau, keeps track of their doings.
It had been nearly 1,000 years since all the magic in the world disappeared, and most people had forgotten it ever existed. Kohinata Mangetsu is a cheerful high school student who has a pretty positive outlook on life, but she has nothing to call her own-- Because she wasn't good at academics or sports, she dreamed of having something she was good at. On a night where the full moon was shining brightly, she happens to meet another girl with the character for "moon" in her name named Shingetsu Ernesta Fukami. That was also when she encountered the mechanical dolls called "ARMANOX."
Shuramaru thinks he is a normal human, until one day a group of strong fighters appear and Shuramaru's life is turned upside down, revealing a power he never knew he had.
Amane Todoroki is a young girl who is straightforward but also unthinking. She will try her very best in everything and say, "I don't know how to answer you if you ask me whether this can be done. I just believe it can. If not, then nothing will get started." She easily gets stuck in her thinking, but she can also get easily moved at something small and start crying.