The 17-year-old girl Konno Makoto is a lively and lively girl. During an ordinary duty, Makoto accidentally fell down, and since then she found that she had the ability to travel through time and space. She was very excited. After mastering the method of traveling through time and space, she often used this method to solve many things in her life that bothered her very much. Makoto, who likes baseball, has a common hobby with two boys in the same class, Chiaki and Kousuke. One day, Chiaki, who was originally a good friend of hers, suddenly expressed her love to her. She was at a loss and traveled through time and space again in the hope of avoiding this incident. But unexpectedly, Chiaki would be with her classmate Yuri, and Yuri has always liked Chiaki. At this time, Guosui, who has a crush on Kousuke, mistakenly thought that Makoto was Kousuke's girlfriend. In order to help solve her friend's problems, Makoto kept going back to the past in the same way. She suddenly found that the number on her arm turned out to be the number of times she traveled through time and space, and the number became less and less. At the same time, she also discovered Chiaki's secret...