Due to an unusual ability to see strange creatures called youkai, Takashi Natsume has never fit in. Over time, he has accepted that no one would ever believe him and has closed himself. When Natsume accidentally breaks an intangible barrier, he frees Madara—a mighty spirit in the form of a lucky cat. Madara notices that Natsume bears a remarkable resemblance to his late grandmother Reiko Natsume, an outcast girl who created the Book of Friends. It is now in Natsume's possession. With no interest in its powers, Natsume decides to keep the book for the sake of his grandmother's memories and to protect it from scheming youkai. Therefore, he makes a deal with Madara: he will hand him the book once his time is up, and in turn, Madara will act as Natsume's unofficial bodyguard. With his newfound goal of freeing those Reiko had sealed, Natsume's relationship with both youkai and humans slowly begins to improve.

完美的班长，羽川翼。 身为阿良良木历恩人的她 在黄金周的第一天，被一只猫所魅惑了—— 那是，被某人禁止的游戏……人变成兽的物语。 被封印的那「恶梦的九日」，如今终于要展露其身姿了！ 这才是现代的 怪异!怪异!怪异! 这是不知不觉间，坠入其中的初恋。

蜂之妖怪远去，不死鸟的妖怪则是逃过一劫的暑假结束了—— 迎接新学期的阿良良木历和少女们，怪异，甚至是比这还可怕的威胁悄然地接近他们。 羽川翼、八九寺真宵、神原骏河、千石抚子、忍野忍，以及战场原黑仪。 她们的独白以及告白——还有告别。 6个新“故事”，现在揭开序幕了。 《物语系列 2nd season》是改编自西尾维新原作的轻小说《物语系列》的电视动画，内容包括《物语系列》中的《猫物语（白）》、《倾物语》、《囮物语》、《鬼物语》和《恋物语》等五部作品。

The story centers on Koyomi Araragi, a third year high school student who has recently survived a vampire attack, and finds himself mixed up with all kinds of apparitions: gods, ghosts, myths, and spirits.

伪物语是伪物的物语(伪即不真实，不成熟，虚伪的)。历和女友战场原是伪物；历的两个妹妹火怜和月火是伪物；欺诈师贝木等也是伪物。而相对的，羽川是个非常强大的真物。伪物语中的怪异都与历的妹妹扯上了关系，引发了一系列的事件。