Emi loves spending time with her older brother, and that day, she was snuggled up listening to him read a picture book before falling asleep. It was just like any other ordinary day—until things took a sudden turn. When she woke up, her brother was gone. Left behind was a note saying he wouldn't be coming back for a while. And so, Emi's first time home alone begins. At first, she happily plays by herself, but as time passes, loneliness creeps in and her longing to see her brother grows stronger. When the doorbell rings, she instantly thinks it's him—but standing there is a strange man nobody ever expected.