Genre - Seinen

His name is Kuruto Kagemitsu -- a cute boy with a vengeance. The demon's name is Shuma. He was summoned, much to his surprise and likely chagrin, by that cute boy, and forced to be his servant. Their goal, one intrinsic and the other quite extrinsic, is to eliminate 71 of 72 of King Solomon's demons -- Shuma being the sole exception for obvious reasons -- who are supposedly controlled by one summoner. Kuruto will show his mother he can do it.

"Such a large number of evil spirit spirits, I need to gather them." Long Ao Tian. Yuan Ding, goes on a trip of gathering devil spirits.

From: Easy Going Scans Sengawa's day job is as an accountant working for the police. But at night... he transforms into a ruthless assassin bringing death to anyone who deserves it. Meet and hire the man with 1000 guns.

Makoto Niwa moves to live in the city and meets his first cousin Erio Touwa at the house of his aunt Meme Touwa. Erio is no longer enrolled on the register of the school and is constantly wrapped in a futon. Erio claims that she is an extraterrestrial life.

After a nuclear war turns most of the Earth into desert wastelands, surviving humans had used the sands in order to survive. One of them is a professional mercenary named Sunabozu, who makes a living by hiring himself out to anyone who needs his talents.

From MangaHelpers: Billionaire Tono Ryuichi, the President of Tono Foods Group, a giant food company, recently acquired two young female assassins from the Mexican cartel. Sui and Ai came from unimaginably poor childhoods and were given a choice between killing people or selling their body. They chose the former and went through an inconceivably extreme training and, at 17 years old, they have become one of the deadliest assassins in the world. They are absolutely obedient to their master and they are given the task of finding the killer that poisoned Ryuichi’s wife and child. They begin attending high school to blend into society and, at the same time, read and study which helps them become even more deadlier on the field. Sui and Ai encounter Matoba Imari who is a high school assassin herself and may be more skilled than both of them. But unlike the two, Imari just wants to lead a normal life. Whatever Imari wishes for her life is not their problem because the only thing Sui and Ai feeds on are bloodthirst and a challenge. [vyc]

Makoto is a quiet, unobtrusive boy with passable looks and average grades. The last thing he expects is to be noticed by Yuuki - a model student who is as popular as he is notorious for his brilliance, his looks...and his uncanny knack for always having his way with everyone. Thus begins the fateful partnership between a nondescript high-school student with budding supernatural powers and an intelligent, charming young terrorist-in-the-making.

There exists a martial arts contest in Japan that is of no concern to boys. Girls who possess the Dragon Queen`s spirit gather at a special academy. The goal - fighting each other to make the soul of the Dragon Queen one once more. How? Why? By fondling their defeated opponent`s breasts, of course!

Detroit Metal City is about a death metal band that has gained immense popularity in the indie scene. The main character is a push-over, Negichi Souchi, who is trying to make a living in the music world, but he didn\'t imagine in his wildest dreams that it would be in such a band. Read and see what hilarious situations he gets himself into.

Clockworkers- mechanical men, created during the war as a weapon to kill as many as possible. That war may be long over, but rogue Clockworkers are still roaming about, spreading fear and death wherever they go. Machina's a member of the CWA, an organization dedicated to the destruction of these rogue robots. Along with Deus, her Clockworker partner, she travels the country in pursuit of these dangerous robots... [MangaUpdates/Horobi no Michi]

Some more stuff to add to the Devilman mythos. This is Kinutani Yuu's second story about Nagai Gou's work.

Set in 2025, a roboticist named Fudou Yuuki joins a project involving a large mural depicting humanity's true past as well as the ancient but advanced technology found in Antarctica.

After the world ended in the original Devilman, Akira Fudo is in hell, seeking the soul of his beloved Miki while at the same time Doctor Hell is beseeching the underworld for power in order to get his revenge upon the hated Mazinger. Akira sets in motion a chain of events that earn the enmity of Hades himself, who'll stop at nothing to avenge the slights Akira commits against him...

Anzai, half vampire, and Tsukasa, an ordinary female college understudy. Vampires appear to live among people. Obviously the administration does not know about their reality, in light of the fact that their appearance does not contrast from people. They likewise dont have to drink blood, however when they get a hankering or get furious, they can wind up wild beasts.

As the Soviet Union walks on Berlin in May of 1945, a cryptic gathering of alchemists and crazy people assembles to perform a frightful custom. They don't watch over the destiny of the Reich. To them, the innumerable lives lost in the fight are the ideal penance to fuel their spell. After the war, they vanish and are not got notification from once more, aside from in gossip. One day, it is whispered, they will return. Furthermore, on that day, the world will end. Dread the evil spirits in human structure. Dread the Longinus Dreizehn Orden. Streak forward to present-day Japan. Fujii Ren is discharged from the clinic following two months spent recouping from wounds endured in an awful fight with his closest companion Shiro. As Christmas methodologies, he tries to revamp his life, sticking to what splendor remains. In any case, even that is soon debilitated. For the knights of the LDO have returned, and conveyed the end of the world to his doorstep. Compelled to wield the same unholy power as his adversaries, will Ren have the capacity to shield what is of high repute to him from the brutal may of the Longinus Dreizehn Orden?