Buddy Collection Extra -Kochou-sou no Kimyou na Gonin-

Buddy Collection Extra: Kochousou no Kimyou-na Gonin includes a new scenario titled “The Peculiar Five of Butterfly Manor” that expands upon the main game's story and characters. Along with that, there's now more voiced character dialogue.

The protagonist (Nagisa) is a high school girl who lost her memory and Buddy in the middle of an operation. She was originally a Special A Class student, but was demoted to an E Class student, which is the lowest possible rank class. E Class is a gathering of problem children who cannot make Buddies with anyone. In order to choose a new Buddy from among them, a camping trip is held. However, an incident occurs during the trip—.