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Unbeknownst to his fellow classmates, Rei Sawatari has spent his years putting together a list of cute girls. One after another, he would confess to these girls to gauge their interest in him, before using the power of his pocket watch to turn back time. An ingenious strategy that is virtually free of risk.

After school, on a day just like that...

A girl falls to her death from the school rooftop. Panicked screams erupted, as her innards splattered on the pavement. Turning back time to see for himself what in the world happened, he frantically made his way up to the roof and threw open the door. He was greeted by a scene he never expected. Suzuki Miu, a first-year girl, was right in the middle of confessing her feelings to his best friend... as Rei waltzed in at the worst possible moment.

Not only is Miu painfully shy, but luck never seems to be on her side. Naturally, it took her everything she had and more just to work up the courage to convey her feelings. In contrast, Rei is only able to confess his feelings with the help of his pocket watch — something he admits himself. Moved by the strange girl and her determination, he decides to do everything in his power to make her second confession succeed. That is how their bizarre three-way relationship came to be.

Meanwhile, our protagonist has to somehow gather up the courage to confess his feelings to one of the other heroines.

This is only the first page of Rei Sawatari's story.