If you liked the Strike the Blood anime, the Anime-Planet community thinks you'd like:
Akuto Sai enters the Constant Academy for Magick Arts hoping to become a high priest and change the world for the better. But when the school's oracle declares his future profession to be 'Demon Lord', he finds himself feared and hated by the entire student population. Now, instead of making comrades and studying for his exam, Akuto finds himself fighting off monsters, bullies, and well-meaning classmates in various states of undress. If navigating a magical high school as a transfer student wasn't difficult enough, Akuto now has to deal with a cute android ordered to observe him 24-hours a day, the precocious attention of the flying, invisible and naked Keena Soga and the advances of the school's most popular girl. Will he be able to overcome his fate, pass his classes, and mend his friendship with the violent Junko Hattori, or will he succumb to his demonic destiny?
This show is a little short but follows the life of a boy who wishes to become a high priest only to found out that destiny has different plans for him and now, against his willl he is to become the demon king.
Both shows have a main character who has been placed in the position of super villain against his will. Both shows also have a cute girl following him around to make sure he doesn't live up that expectation.
Japan has reclaimed its former glory under the guidance of Kings, charismatic individuals wielding incredible powers. But now, one of the Red King's vassals has been murdered, and a viral video shows the killer's confession at the scene. He is one Yashiro Isana, claiming to be the Colorless King; and he is now a wanted man - not only to the Red King's faction, but also the Blues charged with keeping the peace. He is even sought by Kuroh Yatogami, a knight of the former Colorless King sworn to slay any unworthy successor. Only, the subject of their struggle, "Shiro", is a nondescript young man living an unremarkable life in an island academy, and seems to have no recollection of killing anyone. To keep his life, Shiro must prove his innocence; but what is the truth behind his mysterious past, and what will be the outcome of this confrontation of Kings?
I'm making this rec based mostly on the fact that both anime have flashy well animated action scenes. The settings are similar as well. Both take place in a special city where people have various powers. Both shows have some ecchi fanservice but it's not so heavy as to take over the show.
Strike the blood has demons and vampires whereas K the people with powers are still normal humans. K's plot is very convoluted and isn't very interesting, but the show is more about the fluidly animated fight scenes.
If you were a fan of either shows well animated fight scenes, and their settings where people with strange powers are all living together in a special city, then the other may have enough to warrant a watch. There's also a hint of fanservice in each if that's your thing.
The main difference is that in Strike the Blood, the characters are mainly supernatural in origin, so things like demons and vampires are the norm, whereas in K they are super powered humans.
In any case, there are enough similarities between the shows to make one worth seeing if you enjoyed the other.
Touma Kamijo's right hand has the ability to nullify any form of supernatural power, whether it be magical, psychic, or divine; he lives in a city populated by students with these powers. Yet unfortunately for Touma, his arm also seems to nullify good luck. Despite his bad luck, the boy tries to stay out of trouble and just live out his life, trying to be the "good guy" whenever he can; but trouble enters his life one day when he finds a young girl hanging on his balcony. She turns out to be a nun of the Church of England, bearing the Index-Librorum-Prohibitorum - a collection of 103,000 forbidden texts, and as a result has a number of people after her. How far will Touma go to protect his new companion from her pursuers?
Both anime involve a special school for students with super powers. They both have a lot of action and a dash of ecchi fanservice. They're also both really well animated with nice looking fight scenes.
The plot of Railgun is a bit convoluted. Strike the Blood seems to be a little more straight forward. But if you want some pretty action with nice fanservice then try these titles.
The setting for each of these shows is a special city that has been created by some mysterious people in order to house supernatural/superpowered beings. In Index’s case that would be humans with special powers, whereas in Striker the Blood it is designed to hold supernatural beings such as vampires and other demons. So as you can expect each show has the supernatural element at the forefront, as well as the conflicting religious groups to provide some conflict.
The animation in each is pretty decent, for the fight scenes especially. But to be honest, Strike the Blood isn’t really anything other than a fairly average rip-off of the Index series, doing most things in a similar, albeit less impressive manner. Saying that, most fans of Index will probably find something to like about this show, and those of you who haven’t yet seen Index are in for a treat by comparison.
Rin Okumura is a seemingly ordinary boy living at the Southern Cross Boys' Monastery. One day, however, Rin encounters a boy who has been possessed by a demon. Amidst the struggle, he not only awakens latent powers sealed within him, but also learns that he is the son of Satan! No longer able to stay under the protection of the church and with his very existence straddling the line between human and demon, Rin decides to fight against his parentage and joins the True Cross Order as an exorcist. Now, the teen must attend the True Cross Academy and begin special exorcist training alongside his new comrades all while keeping his identity a secret; but can the son of Satan really become a true exorcist?
After inadvertently managing to kill the god Verethragna, taking his divine powers in the process, the once-typical teen Godou's life changed forever. Now a "Campione", a god slayer, the boy constantly attracts both gods' and other Campiones' attentions alike, not to mention the affections of a powerful knight, Erica. Whether he's dodging Erica's advances, proving his strength to others or taking down gods who will wreak havoc on the planet, Godou's new life is anything but normal.
Both anime feature a normal guy who gains Crazy power suddenly and seems to need women to help him unlock it.
Both have girls, action, and some fanservice.
Campione! is probably a bit more harem/fanservice oriented.