S.E.E.S. or the Specialized Extracurricular Execution Squad (特別課外活動部, Tokubetsu Kagai Katsudō-bu) is the protagonist team from the Shin Megami Tensei series of games and specifically the Shin Megami Tensei: Persona 3 video game for the Playstation 2. It's the third game of the franchise and was developed as a supernatural-mystery RPG with deep social aspects. It was developed by ATLUS in Japan, directed by Katsuro Hashino, and character design by Shigenori Soejima. It was released in Japan in July 13, 2006, and in the U.S. on August 14, 2007.
The series was later adapted into a manga written and illustrated by Shūji Sogabe, and began serialization in ASCII Media Works' Dengeki Maoh magazine on September 19, 2008, then to Atlus's official Persona Magazine in November 7, 2011. The team's first manga appearance is in Persona 3 Vol. ? Ch. 1 "??".
The literal meaning of the Japanese name for the team is translated as "Special Extracurricular Activity Department". By the end of the story, they are renamed as "Nyx Annihilation Team" (滅びをもたらすもの Horobi o Motorasu Mono). This translates from Japanese to mean "Those Who Bring About the End".