In 1860s Britain, a boy inventor finds himself caught in the middle of a deadly conflict over a revolutionary advance in steam power.

When 17-year-old Makoto Konno gains the ability to '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.