If you are looking for information on Machiko Ono’s actual work, here are some of her most notable projects: The Mourning Forest (Mogari no Mori)
"AV" could refer to various things, but given the context of an identifier like "ZEX051," it's possible that it relates to the adult video (AV) industry in Japan. Japan has a well-known and regulated adult entertainment industry, with many performers and productions. The identifier "ZEX051" might refer to a specific performer or a catalog number for a video. ono machiko av zex051