Riko Izumi

A perpetually exhausted student at CITY South High School, this young girl is the younger sister of Wako Izumi. Despite her constant struggle with sleep deprivation, she possesses an accidental charm so powerful it has inspired a dedicated local fan club. Beyond her drowsy demeanor, she is a brilliant technical prodigy with advanced skills in robotics and hacking, even assisting her sister by remotely disabling complex machinery during critical confrontations.