"Call Me Tonight" is a short OVA that blends elements of science fiction, romance, and comedy. The narrative centers around Aki, a young woman who works as an operator for a mysterious service called the "Monster Emergency Hotline." This service assists individuals who have transformed into monsters due to various supernatural or scientific reasons. Aki's role is to guide these individuals through their transformations and help them return to their human forms.

The story begins when Aki receives a call from a man named Taro, who has turned into a werewolf after being bitten by a radioactive dog. Taro is desperate and confused, and Aki calmly instructs him on how to manage his new condition. As the conversation progresses, Taro's transformation becomes more severe, and Aki must use her expertise to prevent him from losing control. The interaction between Aki and Taro forms the core of the narrative, highlighting Aki's professionalism and empathy in dealing with bizarre and often humorous situations.

The OVA explores themes of identity, transformation, and the human condition through its fantastical premise. Aki's character is portrayed as resourceful and composed, contrasting with Taro's panic and vulnerability. The dynamic between the two characters drives the story, blending moments of tension with lighthearted humor. The narrative is concise, focusing on a single incident rather than an overarching plot, making it a self-contained and engaging experience.

"Call Me Tonight" stands out for its unique concept and efficient storytelling, offering a brief yet memorable exploration of its central themes. The OVA's brevity and straightforward approach make it an accessible entry into the genre, appealing to viewers interested in unconventional narratives and character-driven stories.