A man travels in time from the year 2027 to relive his school years and to correct a bad decision.

An Earth Federation Army special forces unit called Barghest (or BGST for short) in UC 0084 is created with Lieutenant Colonel Ittou Tsurugi serving as its commanding officer, who is the only officer in the EF military known to carry a katana with him wherever he's on duty.

During the One Year War between the Earth Federation and the Principality of Zeon, an aggressor team known as the Nemesis Team is established in the Earth Federation Army.