A 183cm tall female college student, Kohiruimaki Karen, has a complex about her tall figure and has a poor social disposition because of it. This was changed by the VRMMO game «Gun Gale Online» (GGO). In the game, Karen obtained a dream “chibi” avatar less than even 150cm in height, put on a full-body pink uniform and, as the player “LLENN“, frolicked around the world of GGO. A beautiful player “Pitohui” appeared before LLENN. She was a rare female player in GGO and so the two hit off well――but one day, LLENN was asked to take part in a team battle royale formal tournament «Squad Jam» by Pitohui…..