Yua has given herself seven days to live out the rest of her life.

On day 7, she will die.

On the day she plans on taking her own life, earlier than the expected seven days, Yua finds herself atop the roof of her school, with a crushed paper containing a bucket list in hand. The list consists of seven wishes that she will never have the chance to fulfill.

Yua leaps off the side of the wall, but she does not fall into oblivion. She is caught by a transfer student named Tsubasa, whose warm demeanor leaves Yua with the impression that something about him is not entirely human.

Returning Yua's crushed bucket list to her in pristine condition, Tsubasa announces that she was not alone when she called out to God with her last prayer. Not to save her life but to ensure that it ends as intended, God has sent down a reaper, a boy named Tsubasa, to guide her through the next seven days.