Template:Infobox Item Cool piece are items used for unlocking cool card side stories. To unlock the first side story of a 2☆ card, 200 cool pieces are needed. To unlock the second side story of a 2☆ card, 1000 cool pieces are needed. To unlock the second side story of a 3☆ card, 2000 cool pieces are needed. To unlock the second side story of a 4☆ card, 4000 cool pieces are needed.