Grisaia no Zankou (The Afterglow of Grisaia): A short side-story to The Labyrinth of Grisaia and another DVD bonus exclusive in Japan, it sheds more light onto Yuuji's past and his relationship with his master Asako.It centers around the heroine Michiru Matsushima as she comes up with attempts to form club activities in Mihama Academy to make the school more interesting. Grisaia no Yuukan (The Leisure of Grisaia): A short side-story to The Fruit of Grisaia, it was originally a bonus exclusive to the DVD release of The Eden of Grisaia in Japan.Both parts were released worldwide on August 29, 2015. The first part was released in Japan on August 28, 2014, and the second part on December 26, 2014. It parodies numerous aspects of the genre and is not directly tied to the continuity of the main series.
Instead of branching plot lines with one narrator, the story is divided by a succession of volumes with two main characters doing the narration. Phantom Trigger is an all-ages kinetic visual novel which features a new cast of characters and a plot centered around training students for national security purposes.
