Newly appointed high school teacher Haruseto Kazutoyo held himself to a high standard of pride as a teacher. Disorderly conduct was absolutely out of the question! But then, a beautiful Kansai-speaking girl named Higashiyodogawa Tamayo appeared before him, claiming to be his “childhood friend”! With her calling him “Kazu-nii” and openly getting all lovey-dovey with him at point-blank range, can Kazutoyo really stay true to his “straight-laced teacher” persona...!? A high-energy age-gap romantic comedy between a teacher and his student begins!!