Toumei Dori-chan (1978)

Toumei Dori-chan 1978 / 透明ドリちゃん 1978 /

One day Aoyama Midori is taken to the Kingdom of Fairy, with her younger brother Torao. There, Midori is greeted as Princess Zeelien of the Fairy Kingdom, who has been missing for 11 years, but she refuses to stay in the fairy world because she cannot accept it as a fact. Gambas the Great has no choice but to give her a magic ball, that can make the user transparent, and a magic bell, that can call a fairy. Midori and Torao solve a number of incidents that occur around them with the help of Dream Ball and Fairy Bell. (Source: Japanese Wikipedia)