The S3 Squad (S3班, Esu-san-han) is a special unit within the Commission of Counter Ghoul, handling the highest priority assignments and the most dangerous targets. It is considered an illustrious assignment, with considerable honors involved.
The S3 squad is deployed for special assignments, including the defense of important locations such as the CCG Main Office. It is also charged with carrying out Whack-a-mole operations in the 24th ward, and facing high-rated targets such as the One-Eyed Owl.
Over the years, several prominent Special Class Investigators have headed the S3 Squad.
- Juuzou Suzuya - S3 Squad Commander
- Mikito Urie † (preceded Arima)
- Kishou Arima † (succeeded by Suzuya)
- Iwao Kuroiwa
- Koori Ui (transferred to S1 Squad; Became Bureau Director Adviser) (Formerly)
- Haise Sasaki - Secretary (Defected from the CCG)
- Take Hirako (Resigned from the CCG)
- Hairu Ihei † (transferred to S1 Squad)
- Kousuke Houji †
- Rikai Souzu † (Defected from the CCG)
- Shio Ihei † (Defected from the CCG)
- Yusa Arima (Defected from the CCG)
- 2 unnamed Arima Squad members (Defected from the CCG)
- Tooru Mutsuki (Defected from the CCG)
- Shinsanpei Aura (Defected from the CCG)