This contradiction is not an error but a calculated marketing strategy. The Japanese penal code strictly regulates the production of adult content, requiring all performers to be at least 18 years of age. Therefore, the "13 years old" descriptor is a fictional tag designed to cater to the "lolicon" (Lolita complex) demographic. The inclusion of "Shojo Soushitsu" (loss of virginity) further amplifies the voyeuristic appeal, fetishizing the "first time" experience. The producer is marketing the illusion of a minor—specifically a middle schooler—while legally protecting themselves by casting an adult performer who is simply dressed or styled to look younger. The "High" in the title may refer to the "high tension" or excitement of the scenario, or it may be a recursive keyword designed to capture search traffic, regardless of narrative consistency.