Reina Aharen, a petite and adorable student with a soft voice, is terrible at judging distance and personal space. She's inches close from your face at moments, yet miles away at others! Raidou Matsuboshi, who sits opposite her in class, is the only one who attempts to comprehend her pranks. He has a frightening appearance, but in truth, he is a kind young man with a vivid imagination. Aharen-san wa Hakarenai follows the unusual couple as their strange friendship blossoms after Raidou picks up Aharen's eraser for her. She misinterprets his gesture and now believes they are closest friends, demonstrating how the simplest of things may turn out to be the most difficult of obstacles.