Okajima Rokuro is a small-time salary man who is carrying documents for his company, when the ship he's traveling on is attacked by pirates. Kidnapped, he discovers to his dismay that his employers' main concern is to ensure the documents don't get into the wrong hands, even if it means sending the carrier to the bottom of the sea. Now, with his former life ruined and his kidnappers seeming comparatively friendly, "Rock" decides to join their merry band of mercenaries, and sets out with a new career to the shadier corners of the South China Sea.
Strange recommendation is it not? Follow along with me a second. Forget Misaka and the other girls, and forget about Rock and Revy.
The real character in both of these series are the Cities they both take place in. Academy City, the home of the Railgun and Index story is a thriving bustling metropolis with an underlying sinister nay almost evil side to it.
Black Lagoons Roanapur is a gritty, ugly place where the sinister underside and evil is clearly out in the open for all to see.
Both series revel in the characters trying to survive their day to day lives in the swirling whirlpool of their cities influence.
I can't think of two completely different series on equal footing.
Have a problem? Talk to Otogi Bank, a student aid group that helps people get what they need – for a hefty price. Led by Liszt Kiriki and staffed by tsundere Ryouko, inventor Majolica, jealous Otohime, flirtatious Tarou, serious Alice, nervous Ryoushi and maid Otsuu, Otogi Bank assists with everything from helping break into a rival school to convincing an upperclassman to not quit a sports team. Can Otogi Bank manage to make all their clients happy, and most importantly, will Ryoushi ever manage to win Ryouko’s heart?
Both feature a tsundere lead girl with a seemingly unsurmountable powers (although not really), they also both feature the VA Satomi Arai. The difference is that the Railgun franchise is actually rather enjoyable, with IMO good characterisation, a great setting, and some interesting plot points. Whereas Oookami-san starts off with a lot of potential and fails at every chance it is given, having said that Ryouko Ookami IS an interesting character with a backstory that makes her a justified tsundere, and the character design is really quite lovely. Both made by JC Staff too.
Sakai Yuuji thought he was a normal high school student, until one fateful day when time stopped. Watching in horror, he witnesses a monster devouring the "frozen" people around him; but luckily for Yuuji, he is saved by a sword-wielding red-headed girl that calls herself a "Flame Haze". The girl informs him that he has been dead for some time now and that his current self is merely a replacement for the human that he used be while alive. He is, she says, merely a torch whose life will come to an end when the blue flame in his chest ceases to burn. After this rude awakening, Yuuji realizes that he is able to see the flames of life in other "torches"; and after discovering that a friend of his is also a torch -- and her life is burning out faster than his – he gains the courage to live out the rest of his life with meaning. Will Yuuji be able to find his place in the world before he ceases to exist?
In the future, select humans have begun to evolve and acquire special ESP powers – powers that the rest of the populace fear and detest. While some ESPers are harmless, others desire to use their powers for their own personal gain. In order to suppress this threat, identify new ESPers and protect those with powers from the public, the B.A.B.E.L. organization is founded. At its helm are three ten-year-old ESPers: Kaoru, Aoi and Shiho. Together, they will put a stop to crime and attempt to gain the trust of the public; but can their guardian, Kouichi Minamoto, manage to help the girls mature enough so their selfish actions will stop hurting the world around them?
Both series follow a group of children with psychic abilites, dubbed espers, as they balance their personal lives with fighting crime. Both series also share a technologically advanced setting where science is integral to their way of life. Comedy is a trait that both series also share, although Railgun is quite a bit more serious than ZKC.