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。

Koyomi Araragi was turned into a vampire by the legendary vampire, Kiss-shot Acerola-orion Heart-under-blade, and he needs to revive the weakened vampire back to her complete form to return to being human again. The only way for Koyomi to achieve his goal is to fight the three vampire hunters – Dramaturgy, Episode and Guillotinecutter.