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.

销量突破200万册，经久不衰40年！ “日本科幻小说教父” 筒井康隆经典之作 7度被影视化，日本票房收入2.6亿！ 2006年同名影片击败宫崎骏的《地海战记》 勇夺日本学院奖最佳动画片！东京动画节最佳动画奖！ 放学后，理科实验室里响起一声玻璃碎掉的声音。 破碎试管里流出的液体，正微微冒着白气，散发出薰衣草的甜香。 正在打扫实验室的国中三年级女生，芳山和子，忽然间意识恍惚了一下。一股浓浓的甜香猛然袭来，让她禁不住打了个趔趄，随后慢慢瘫倒在地上。 等到她再次睁开双眼，周围的事物、时间和记忆都发生了奇妙的变化，不可思议的事一件接着一件······