A common abbreviation for enjo-kosai (援助交際), a practice where older men give money or gifts to younger women for companionship, which can range from social dates to sexual encounters.
In 2021, the Japanese "delivery health" market was still recovering from the COVID-19 state of emergency restrictions. During this time, "Bijin Anego" (Beautiful Older Sister) and "Jukujo" (Mature Lady) categories saw a surge in popularity as younger providers left the industry. Kansai Enkou 45 Chiharu 2021
This indicates the release or recording year of the content. The "Kansai Enkou" Series A common abbreviation for enjo-kosai (援助交際)