Until now, life has been effortless for Miharu Seno, a second-year high school student. He is regarded as attractive, achieves top grades without difficulty, and—whether through skill or luck—consistently defeats his friend Kenya Fujishiro in video games. However, Miharu's good fortune reverses when a creature resembling a stuffed animal steals his wallet at an arcade. Lured into an abandoned storage room, he is confronted by a man in strange attire who emerges from the other side of an electronic screen. This flamboyant individual, who calls himself "Romeo," explains that he has traveled from the future to partner with Miharu in the "D-Game." Also from the future, the stuffed animal Edward will serve as the pair's Judge. Although Miharu is unimpressed by the vague prize at stake, he detests the idea of losing by default. Consequently, he declares his intention to not only play the game but also emerge as its victor. His decision proves fortunate, as the fate of losers is more severe than mere shame—those who are defeated are sentenced to death.