Otouto wa Ningyou no Naka ni

A certain young man has always longed to see the doll his deceased little brother, Rio, wanted to create before he passed. One day, while rummaging through a closet, he discovers an old book concealing a leaf of paper. The sheet turns out to be a blueprint that details a complex doll unlike any other, and the young man begins to work on constructing it. After running out of materials, he leaves behind the partially finished doll, only to be captured by a group of petty criminals. As they are about to end his life, who comes to his rescue but...