I actually watched the new AV featuring Teacher Koharu, and to be honest, it was disappointing. The scenario of a gentle, beautiful teacher showing masturbation in a twilight classroom at a student's request isn't bad in itself—elements like taking off her skirt, exposing her breasts from her shirt, and boldly massaging her chest while reaching down there are indeed arousing. However, the crucial binaural recording doesn't function at all, lacking immersion; sounds of clothing rustling and heavy breathing only come from the front, are too quiet, and not three-dimensional. This makes it pointless to invest in expensive binaural equipment for viewing, and buying a regular work would be more economical in terms of both capacity and cost. The price of around 1000 yen is clearly too high for this quality. Since the work has just started, I have hopes for future developments, but at this point, I can't recommend it.