In fourth grade, Hiroshi Tamiya, Riku Kaneda, and Katsuya "Dafu" Tabuse established a hideout in an abandoned factory they named the "Hikari Club." It provided an enjoyable escape, allowing them to play chess and hone their slingshot abilities. However, their fate took a dark turn when Hiroyuki Tsunekawa accidentally discovered their hideout. He became obsessed with world domination and proposed the construction of an intelligent robot. As the club grew and the robot neared completion, Hiroyuki's influence over the group escalated, causing them to forget their original intention. Tamiya was left wondering if their treasured childhood friendships would ever be restored.
