Attack on Titan: Season 1 is the first season of the anime series Attack on Titan, based on the manga of the same name by Hajime Isayama serialized in Bessatsu Shōnen Magazine. It consists of 25 episodes. The series begins with the first attack of the Titans after over a century of peace within the gigantic walls that protect humanity and ends with a battle against a female Titan.
From episode 1 to 13, the anime's opening theme song is "Feuerroter Pfeil und Bogen" (紅蓮の弓矢 Guren no Yumiya, lit. "Crimson Bow and Arrow") by Linked Horizon and the ending theme song is "Utsukushiki Zankoku na Sekai" (美しき残酷な世界, lit. "A Beautiful Cruel World") by Yōko Hikasa. From episode 14 to 25, the anime's opening theme song is "Die Flügel der Freiheit" (自由の翼 Jiyū no Tsubasa, lit. "Wings of Freedom") by Linked Horizon and the ending theme song is "great escape" by Cinema Staff. More: en.wikipedia.org.