Makoto is an ordinary school girl up until the point where she discovers that she can time leap into the past. While looking around in a laboratory one day at school (as all school girls do), she falls and crushes a wallnut on the floor which leaves a number on the back of her arm. It is only until further on in the story when she discovers that the changing numbers on her arm represent the amount of times she is able to leap into the past.
The first time she discovers that she has this handy ability is when she is about to be hit by a train. She speeds into a rail crossing unable to stop her bike due to faulty brakes - at which point her ability took over and hurled her back a few minutes into the past...
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