人類は十進法を採用しました

This image depicts a full-body view of Rumia from the *Touhou Project* series. She wears a bold smile and has her arms spread straight out to the sides, forming a shape reminiscent of a cross or the letter "T," while showcasing a well-endowed figure. Although the background is shrouded in darkness, glowing icons resembling directional pads (D-pads) shine behind her, and multicolored neon lights create a cybernetic atmosphere. The scene evokes the feeling of inhabiting a world of D-pads, with red and blue tones standing out prominently. It captures a cool, dramatic moment—much like the instant before a battle begins in an anime.