What's the "right" order to play the Grisaia Spin-offs?
Leisure of Grisaia = Grisaia no yuukan
Melody of Grisaia = Grisaia no senritsu
Afterglow of Grisaia = Grisaia no Zankou
Le fruit de la grisaia = Grisaia no kajitsu
Le laberynth de la grisaia = Grisaia no Meikyuu
Le eden de la grisaia = Grisaia no Rakuen

Right order


Parent game: Grisaia no Kajitsu.
Side story: Grisaia no yuukan
Sequel: Grisaia no Meikyuu.
Side stories: Grisaia no senritsu and Grisaia no Zankou. Since you completed the main game the side stories can be played in any order.
Sequel: Grisaia no Rakuen