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.
Aired 24/12/2011EP 12 - Words of a Vow
Shakugan no Shana: Season III
Continuing from the events of the last series (Shakugan no Shana II), both Shana and Kazumi stand at their respective locations waiting for Yuji to meet with one of them, only to discover that Yuji has disappeared, with not even the slightest evidence of his existence left behind. All is not lost however, as the letters the two of them sent to him still give hope of Yuji's continued existence. As Shana and company search for answers on Yuji's whereabouts, they soon find the truth staring back at them when Yuji reappears in front of them as the leader of Bal Masqué. Left with little choice, Shana must now confront her most unlikely adversary on the battlefield in her toughest challenge yet.
(Source: Anime News Network)