Kuromori-san wa Smartphone ga Tsukaenai manga is about When Suzuki Oji enrolled into high-school, he was hoping some kind of excitement would fall into his life — but he never expected it to take the form of Kuromori Kisaki, a descendant from a 400-year-old clan of witches! However, Kuromori needs a special brooch in order to fly on her broom, something she lost when she landed on Suzuki after he had mistakenly thought she was falling to her death.Although he initially thinks Kuromori is being unfairly difficult to socialize with due to her "witch" status, he finds and returns the brooch to her. Out of gratitude, she shows her magic to him through the use of her broom. Suzuki then questions the possibility of himself flying by also wearing the brooch, but right after Kuromori pins it to his coat, both of them suddenly find themselves several feet in the air before falling into the school's swimming pool! Just who or what is Suzuki…?