An Ending Book is a summary of one's life that's left behind for their loved ones. Alma has recently lost her grandfather and has resolved to take over his Ending Book shop, even though she's so shy that she can barely speak. Lately, she's been dreaming about two strangers, a man and a woman, every night. One day, a customer shows up and he's literally the man of her dreams! The rumor goes that he's immortal, so why would he need an Ending Book? Alma thought it was all just a dream, but it turns out the man's actually real. How exactly is she connected with him...?