Japan has traditionally had lax laws regarding deepfakes compared to the EU or the US. However, the "Saeko Matsushita AI" phenomenon has contributed to a legislative shift.
In another context, Saeko Busujima is a character from the anime and manga series "High School of the Dead", and there is also a character named Saeko Matsushita who appears in the light novel series "The Ryuo's Work is Never Done" but I couldn't find much info related to "ai" and Saeko Matsushita. saeko matsushita ai