Sumire 16!!

The manga chronicles the days of Sumire, a lively 16 years old girl. However, Sumire is not a common girl: she is a life-sized marionette, controlled by an old man in black clothes. Sumire seems unaware of her puppet nature, although the rest of the cast are very aware that she is a marionette, but they become more or less accustomed to her weird nature.