In 2019, childhood friends Yashio Kaito and Senomiya Akiho are in their final year of high school. They are the sole members of the robotics club, which has lost its school funding. Akiho is passionate about robots and longs to complete the robot her older sister Misaki began building in the same club. Kaito is not particularly interested in robots and is obsessed with video games, specifically "Kill Ballad Online." However, he remains in the robotics club because of his friendship with Akiho. Now, shortly after Kaito is accused of cheating in his favorite game, Akiho decides to risk the club's existence in exchange for the funding needed to finally finish her sister's giant robot...