Konpora-sensei 2 - Dai-chan Jr.

コンポラ先生2大ちゃんJr.

Prequel

Konpora Sensei
コンポラ先生
manga

Sequel

Konpora Kid
コンポラキッド
manga

The time is set in the Mechatronics Era in the future. In this era, schools actually float in the Tokyo sky at around 2000–3000 meters. At home, there is freedom in movement as everyone has a flight mechanism within them which allows them to fly. Transportation is made easy as a result. Source: ANN