I watched the fourth installment of the Corner Masturbation series, and it's truly an ambitious work that pursues realistic climax. The actresses naturally stretch their legs straight while immersed in self-pleasure, a manifestation of instinctual pleasure that draws viewers in with its intensity. Particularly, Kitajima Mirai (also known as Fujisaki Erina), playing the girl in a denim miniskirt, initially seemed like direct friction might be painful, but her intense sensation amplified the eroticism, combining with her cuteness to create the best scenes. On the other hand, Yoshizawa Reika's portrayal of the female teacher, with her upward gaze and braless nipple lines, was exquisite, and the psychological depth reminiscent of middle school trauma made the fourth scene out of eight especially memorable.

However, the work as a whole has issues with camera angles. Shooting from overhead reduces the impact of corner masturbation, and I wished for more low-angle shots to capture the essence of friction. The lack of side and rear shots, and not fully filming panty lines or friction without underwear for all actresses, was disappointing. Additionally, insufficient labeling of actress names, with the first high school girl role and the third teacher role onwards being unknown, is a concern for fans. I'd love to check out their other works if available, so more information is needed. Overall, while the situational integration is commendable, there were many technical aspects that felt lacking. I look forward to improvements in future series.