Hinata, an innocent high schooler, is suddenly confronted by his super sexy tutor, Aoi! In addition, Aoi looks exactly like the sexy actress Sumire Nanasato. WIth both parents out of the house, Hinata is at the mercy of Aoi-sensei. Will he be able to study without losing his mind? This is the start of a lesson about worldly desires taught by a super sexy Onee-san!