Aika Tsube

As a fifteen-year-old freshman at Yougetsu Private Academy, this devoted childhood friend shares a deep, protective bond with Souji. She frequently adopts a nurturing, maternal role toward him, watching over his well-being much like a dedicated older sister would. Despite her youthful age, her primary focus remains centered on supporting Souji through their shared daily lives, maintaining a constant and watchful presence in his journey.