Shakugan no Shana T3 E12 – Words of a Vow
Wilhelmina, Caramel and Khamsin begin a long and hard fight against Sabrac, which seems to be impossible to win. Shana leaves them and meets Snake of the Festival, who has awakened his true form, and promises him to fight him, make him the person he used to be and to live in a perfect world along with him. She has realized that the two personalities of her weren't the Flame Haze and the person, but the one who would and the one who wouldn't fight for the dream of a perfect life. But both have one thing that asures the chance for this dream to be realized - the most powerful unrestricted spell, Love.
Shakugan no Shana
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.