"I can do it because I'm the older sister!" Ddolddoli, who was having an ordinary day bickering with her annoying younger sibling 'Ttolangi', encounters a suspicious witch one day. After that, 'Ttolangi' disappears, and a cute baby dinosaur appears before her eyes! For some reason, the family has no memory of 'Ttolangi' at all. Only the older sister 'Ddolddoli' can find 'Ttolangi'! Can 'Ddolddoli' find her missing sibling 'Ttolangi'?