One day on her way to school, the chain on Renge Ohyama’s bicycle snaps leaving her stranded by the side of the road, that is until the friendly Sumire Yotsuya offers to help. The only problem is Sumire isn’t a normal teenage girl but actually a doll being controlled by a creepy middle aged man! Fleeing for her life, Renge hopes never to see the strange duo again, however when she arrives at her new school she not only learns that Sumire is her new classmate, but also sits right behind her and is intent on becoming friends. Now Renge must deal with the enthusiastic ideals and affections of her new pal as Sumire tries to fix every problem and help every person she encounters – even if no one takes a creepy old guy and his doll all that seriously.