花火与小爱在旁人看来就是一对理想中的情侣，但实际上两人只是为了无法实现的恋情而烦恼的契约爱人，并过着将对方当做所爱之人，互相感受温暖的日子。不断为了重要的人而感到受伤的青涩青春模样，比谁都更加单纯却更加扭曲的爱情故事。

一个来自美国的记者，突然被派遣到俄罗斯工作，他在俄罗斯发生的各种搞笑的事情

When 17-year-old Makoto Konno gains the ability to, quite literally, "leap" backwards through time, she immediately sets about improving her grades and preventing personal mishaps. However, she soon realises that changing the past isn't as simple as it seems, and eventually, will have to rely on her new powers to shape the future of herself and her friends.