Loveless

Not a bad anime on spells + fighting and a little sadism/masochism aha

Warning though, contains shounen ai and shoujo ai (yes, boy's love and girl's love -- there are also hetero couples too -- it's mild though [kissing lip to lip only]) Although the original mangaka did not intend for this to be any of those content -- fans just label it as yaoi aha

Even if you don't like these genre, take a look at opening, not a bad song ^^ Ending song is pretty relaxing
Also take a look at fanmade trailer (included for those unsure//iffy)

Furthermore, if you don't like an anime that contains a cliff hanger at the end + don't like to read manga, this is not the anime for you so consider yourselves warned

P.S. NYAH~ main protagonist voiced by female

Following information taken from Anime News Network

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Alternative title:
Нелюбимый (Russian)
ラブレス (Japanese)

Genres: adventure, drama, fantasy, mystery, romance, supernatural

Themes: abuse, catboys, catgirls, shounen-ai, yaoi

Objectionable content: Significant (bloody violence and/or swearing and/or nudity)

Plot Summary: Twelve-year old Aoyagi Ritsuka is left with his insane mother as his only family when his brother, Seimei, is killed suddenly. After moving to a new school, he meets Agatsuma Soubi, who claims to have known his brother. Ritsuka eventually discovers that Soubi and Seimei used to be a fighting pair, whereby Soubi was the "Fighter" and Seimei was the "Sacrifice". Now that Seimei is gone, Ritsuka has inherited Soubi, who will become his "Fighter". After learning that Seimei was killed by an organisation known as the "Seven Moons", Ritsuka decides to investigate into his brother's death, with the sometimes useless help of Soubi, along the way.

Number of episodes: 12
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Opening:


Ending:


Fanmade Trailer (0:59 picks up):

Too bad no official trailer for this meh

This is one of the few fight scenes (contain spoiler but yeah -- watch at your own risk :])