Makoto Konno, a high school student in Tokyo, discovers she has the ability to leap through time after a strange accident in her school’s science lab. Initially, she uses this power for trivial matters, such as avoiding awkward situations, acing tests, or reliving enjoyable moments. However, as she continues to manipulate time, she begins to notice unintended consequences. Her actions disrupt the lives of those around her, particularly her close friends, Chiaki Mamiya and Kousuke Tsuda.

Chiaki, a transfer student with a mysterious demeanor, reveals that he is from the future and has been searching for a painting called "The Witch's Hour." This revelation ties directly to Makoto’s newfound ability, as the time-leaping power originates from a device Chiaki accidentally left behind. The narrative explores the ethical and emotional complexities of altering time, as Makoto’s careless use of her powers leads to increasingly dire outcomes. She learns that each leap reduces the number of times she can jump, adding urgency to her decisions.

As the story progresses, Makoto is forced to confront the limitations of her ability and the inevitability of certain events. Her relationship with Chiaki deepens, revealing his true intentions and the sacrifices he must make to return to his own time. The climax centers on a pivotal moment where Makoto must choose between her own desires and the well-being of her friends, ultimately leading to a resolution that emphasizes the importance of accepting the flow of time and the consequences of one’s actions.

The characters are grounded and relatable, with Makoto’s growth serving as the emotional core of the story. Chiaki’s enigmatic presence adds a layer of intrigue, while Kousuke provides a contrast as a more straightforward and supportive friend. The narrative balances lighthearted moments with poignant reflections on time, responsibility, and the inevitability of change, making it a compelling exploration of its central themes.