Rokuro Okajima is a small-time salaryman 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?
300 km south of Tokyo lies Itogami Island - a man-made landmass that’s been authorized by the government to house spirits, vampires, mermaids, and other magical beings who’ve been pushed to the brink of extinction. Kojou Akatsuki is one such resident who used to be a typical high school boy, until an incident 3 months ago turned him into the Fourth Progenitor - a powerful vampire - against his will. And while he’d rather stay an anonymous teenager, things change when Yukina, a sword shaman from an anti-terrorism agency, arrives with intentions to watch over and potentially eliminate Kojou...
Each anime centers around a group of teenagers who are enrolled in a school, and live in a city that is specifically designed for people with supernatural powers. In Railgun it's humans that have extraordinary powers, whereas in Strike the Blood there's more of a fantasy element where the inhabitants are all supernatural beings such as vampires, but both contain magic users.
Both can be pretty serious when they want to be, but have their cute, fun sides as well, with a dash of fanservice added in for good measure. The action in each is also well animated, especially in Railgun.
Fans of one may find the other appeals to them.
Ran Isozaki is a typical middle school student with a typical crush on her childhood friend Rui, and a not-so-typical ability: she has just discovered that she has the power of telepathy! Though she'd rather be finding ways to get Rui's attention, Ran finds herself in the middle of sinister supernatural situations; but she's not alone! Joining Ran is the cocky and beautiful Naha Midori, a fellow telepath who has just transferred to Ran's school. Together, Ran, Naha and Rui will experience the joys of middle school, and the perils of the supernatural!
Both series follow a group of school children with supernatural abilities. Both also feature several characters who are generally considered to be love or hate types. The main difference is that in Telepathy Shoujo Ran the children keep their powers a secret, whereas in Railgun the children are at a school specifically designed to enhance their powers.