Kaori Aihara, a year his junior, develops an instant crush on the protagonist after he prevents her from tripping. Their manga introduction unfolds on a rain-soaked day when he offers her his umbrella—a gesture cementing her romantic fixation. Viewing his female guardian spirits as rivals, she resorts to playful extremes to monopolize his attention, fueling comedic scenarios through relentless antics. Driven by jealousy and an insatiable need for acknowledgment, she emerges as a tenaciously clingy presence in the romantic rivalry encircling him. Her role centers on navigating unrequited affection and vying to disrupt his bond with the supernatural entities. The story leverages her overzealous schemes for humor rooted in misunderstandings and charged romantic friction, though her development beyond these dynamics remains unexplored in existing records.