Reina Aharen, a little student with a soft voice, has trouble 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 threatening appearance, yet he is actually 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. She misinterprets his gesture and concludes that they are closest friends, demonstrating how the simplest of tasks may prove to be the most difficult.