Kurokami The Animation

The main male character meets a girl with extraordinary power, both anime are very similar in some way that i can't really explain it ><! 

Supernatural and a ordinary guy with extraordinary power :) 

They have very similar, if difficult to nail down, feel about them. 

Very similar. At first I thought it was done by the same studio, but I was wrong. Now a "ordinary" guy meets a girl with supernatural powers. In Shakugan this "ordinary" human, Yuuji, is the compartment of the Reiji Maigo, in Kurokami it is yet unknown what role does Ibuki Keita plays, but he "isn't a ordinary human" like Excel says on episode 4. The girl with supernatural powers is forced to stay near the human boy. In Shakugan because Shana has to keep a eye on the Reiji Maigo and in Kurokami because if Kuro doesn't stay close to Keita her fighting abililies decay due to the contract they made. Lastly the "world balance"concept is the main similarity present in both animes, in different yet similar ways. In Shakugan people gets eaten by Guze no Tomogaras and has to be replaced with "torches" for sake of balance. In Kurokami a person's soul divided in 3 parts, each one containing a porcentage of luck (50%, 30%, 20%) to maintain a balance in the world. Yet people try to consume their other part to have as maximium luck as possible. A "Flames Haze" maintains that balance in Shakugan no Shana and a "Mototsumitama"does sort of the same in Kurokami.  read more 

Oedinary guy meets a supernatural girl and at some point they start to fight together. Similar atmosphere 

Both are about a male who get's caught up in trouble because of being around a strange godlike girl. They both are fairly action packed as well. 

Boy & Girl partners in the quest of justice, and some lovey-dovey stuff 

Both anime share the same types of characters : Tsundere with high power and an lonely boy. Both anime share a lots of rebound in the story and high fighting rhythm. 

They have too similar stories. A guy runs into a girl with red hair who is not really human. He finds out that he is not real from her and then the go on a journey to save the day. The fact that Shana and Kuro don’t seem to have any shame or knowledge of regular social female behavoiur. I was almost confusing the stories that is how similar they are. 

Both consists of a main character who's a guy. He meets a special girl with fighting abilities, both very powerful. The guys are somehow bonded to the girls, forced to, and they help fight enemies and such. there are also romantic moments.  

Kurokami and Shakugan no Shana are very alike, Shakugan no Shana might be a bit better, but if you want more, go watch Kurokami 

The both seem to have the same idea around them, both end up having magical powers and have to fight stronger people, Both have partners that use there own life/power to help the other. 

Both main Girl characters have Red Hair Both Guy characters are just another life and not really do much Both guys wants to help their red haired partners  

In both anime, the main character makes a contract with another character. You also get the same vibe from watching both. 

Both anime are about an average and boring guy who suddenly meets a strong and cute girl who has super powers. The two make a contract together and (initially) have a master-servant relationship, where the girl fights, and the guy is basically useless. Also, in both anime the main guy is an orphan, and has a childhood friend who is clearly in love with him (Sakura in FSN, Akane in Kurokami). Both are shounen anime which have fantasy, magic, action, and drama. Kurokami is more fast-paced and overall better than FSN, though. 

In both anime we have a more or less normal male protagonist who makes a contract with powerful supernatural being (or more precisely a girl). As time passes both are trown into a lot of fights and they learn to how to effectively support their supernatural partners (althought they are always supporters and they practically cannot fight on their own). 

The story is about a man who make contract with unknown woman because he was in the verge of death,after he was been saved by the woman he is find out about doppel liner system bit by bit then he find out that he was root.although he was not root he still fight to change his destiny. 

They both have's similar aspect's like FSN...In both anime's there are mark's on the hand's of the fighter and in both anime's just 1 person fights and the other one give's commands.Very similar stories 

These two anime have a similar air to them. Shirou can be compared to Kurokami's male protagonist Keita, as they both enter a world of fighting with beings far greater than themselves. In F/SN we have servants while in Kurokami, we have Motutsumitama. If you like F/SN, you'll definitely enjoy Kurokami 

although the ambition of the protagonist in each anime is different but both protagonist character is rather similar very determined despite their lack of power and willing to sacrifice itself to save the people. theres also about forming contract however in kurokami is not a contract between ancient champions but more with a powerful race known as motosumitama. 

characters are very alike in both animes, even their fighting styles. both have the same story line ie, guy having girl as a fighting partner 

both include bonds being made by a human guy to a magical girl. 

Similar Plot and Background story, some girl with superpower suddenly jump into someone's normal daily life and make a contract with him......... Both are romance, action and Super Power 

Both have mysterious people with powers, follower and master setup, making a pact of some sort, and some organization trying to corner the whole battle and the world or something like that. Both have a similar feel to them 

Both anime start with a guy being killed while he tries to save a girl with super powers and in exchange of having their lives saved by the girls, they are dragged into a fight to save the human race. The story line is pretty much the same. They both have lots of fighting scenes and deal with super natural stuff. However I believe Busou Renkin is a much better anime. 

Both of the male leads are thrown in a supernatural and known world where battles are being fought for control of the planet. In Busou Renkin it's the homunculus and in Kurokami its the doppeliner system. Both protagonists start off weak and get in the way of the female leads, but as both series progress they both prove to be invaluable partners.  

In both of these series, the main heroine helps the protagonist by saving his life. From then on, they become a partner of sorts. There is comedy, action, drama, and even romance later on in the series. Both anime(s) also has more emotional drama as episodes progresses along with various plot holes. Overall, a good idea to keep an eye on both if you're interested in some fantasy and action. 

The atmospheres are quite similar, and both deal with people who can use certain kinds of magic. Steiner and Excel (Kurokami) seem to be somewhat like Kanazaki and Stiyl (To Aru Majutsu no Index). They both had confrontations with the main characters and faught to either kill them or take them somewhere (mostly directed to Index and Kuro). Although after awhile, they became companions with the main characters. Reishin (Kurokami) and Izzard (To Aru Majutsu no Index) were both seen as the main threat, but half way through the series it changes to someone else. To Aru Majutsu no Index has multiple sets of characters who come from specific 'Church's' and are sent to take out the main characters, while Kurokami have people from different 'Clans', also set to take them out and obtain power. Kuro and Index both seem to be important to their respective areas. Index being important as she has 103,000 of the grimoires stored in her memory, and Kuro as she is the princess of her tribe. They both encounter somewhat regular high school boys who both have their lives changed afterwards. read more 

In the two serie, a boy meet a girl with strange power and their is people who want to catch her. 

Both series contain a similar main female protagonist with a huge appetite for food when they first mysteriously meets the main male protagonist. Both series gets somewhat darker as the episodes progresses. Both series has a mixture of comedy, drama, fantasy, action, and romance. Both series features magical battles. 

Although Pandora Hearts is still ongoing (19 of 25), it has a similar dark feel to the story and also involves contracts between other beings. Instead of Mototsumitama it has monsters called Chains but otherwise just as awesome. Pandora Hearts has a more gothic feel to it. 

The main character form a contract with a mitotsumitama(in Pandora heart, it's like chain) to escape death( in P.H., it is to escape the abyss).. It is also fate that brings them together (apply in both series)... And also, the contractor of the main character have 1 purpose to live and that is to kill his brother( in pandora heart, the 1 purpose is to find her memories) 

Similar plot and background, a girl with super power suddenly appare into this boys life and for whatever reason they sign a contract together and fight against......bad guys Both series has some kind of romance in it and on top of that the action is awesome 

both are pretty violent, and about a girl who makes some sort of contract with a man, with intense hand to hand combat 

Both anime have the same author and feature a male protagonist who fights alongside a stronger female protagonist throughout the course of each anime. 

Both series contain supernatural elements with the main heroine being a strange girl with an unique talent. There is a mystery like atmosphere surrounding both series involving this girl and as the episodes progresses, more depth of both series is explored. Then of course, there is action, fantasy,comedy, and drama. There's not so much romance so if you're looking for such a theme, then both series may disappoint. Still though, both series are a great watch.