Shakugan no Shana

is a Japanese light novel series written by Yashichiro Takahashi, with illustrations by Noizi Ito. The series began publication on November 9, 2002 by ASCII Media Works under their Dengeki Bunko publishing imprint.

The first two volumes of the light novel were released in english in 2007 by VIZ Media. The license to the english translation was lost, leaving two volumes released.

Synopsis
The world has become a slaughtering ground for the Crimson Denizens, mysterious beings from a parallel universe who thrive on the life energy of humans. These merciless murderers only leave behind scant remainders of souls called "Torches," which are mere residues that will eventually be destroyed, along with the very fact of the victims' existence from the minds of the living. In an ambitious endeavor to put an end to this invisible, hungry massacre, warriors called Flame Hazes relentlessly fight these monsters.

One fateful day, Yuuji Sakai ceases to be a regular high schooler—he becomes trapped in a crevice of time and is suddenly attacked by a Denizen. Coming to his rescue just in the nick of time is a nameless hunter who seems no different from an ordinary young girl except for her blazing eyes and burning crimson hair. However, before Yuuji can learn anything more about his situation, he discovers that he has already been reduced to a Torch—merely a scrap of memory waiting to be extinguished.

Shakugan no Shana
An anime adaptation of the light novel. It aired for 24 episodes between October 6, 2005 and March 23, 2006.

Shakugan no Shana II (Second)
The second season of the anime that adapts the light novel. It aired for 24 episodes between October 5, 2007 and March 28, 2008.

Shakugan no Shana III (Final)
The third season of the anime that adapts the light novel. It aired for 24 episodes between October 8, 2011 and March 24, 2012.

Shakugan no Shana S
OVA of the anime. It adapts the light novel. It aired for 4 episodes between October 23, 2009 and September 29, 2010.