Founded in 2000, OAK Fertility Center Japan is a professional medical group dedicated to women, with core services including infertility treatment, in vitro fertilization (IVF), and gynecology/obstetrics. Currently, OAK operates four clinics across Japan, located in Sumiyoshi, Namba, Umeda (Osaka), and Ginza (Tokyo). Among these, the clinics in Sumiyoshi (Osaka) and Ginza (Tokyo) offer IVF and related assisted reproductive technology (ART) services.

OAK Fertility Center Japan boasts a team of over 20 professional physicians, providing clients with IVF and related assisted reproductive services for infertility. The center excels in key areas including in vitro fertilization (IVF) embryo culture, infertility treatment for advanced-age patients, ovarian disorders, embryo/egg freezing, genetic counseling & eugenics, PGD (Preimplantation Genetic Diagnosis) testing, male infertility treatment, testicular sperm extraction (TESE), and fallopian tube reconstruction.

OAK Fertility Center Japan conducts nearly 3,000 IVF cycles annually, catering to clients from Japan, Mainland China, Taiwan (China), Europe, and the United States. The center features a specialized fertility facility equipped to support advanced reproductive treatments, with state-of-the-art technologies integrated into its services.
In April 2007, the IVF operation rooms at the Sumiyoshi Obstetrics and Gynecology Clinic were expanded from one to two, enabling the performance of up to 20 egg retrieval procedures daily. Additionally, in 2016, a new clinic with a dedicated fertility center opened in Ginza, Tokyo. As a key base, this facility offers a fully optimized environment designed for enhanced patient accessibility and comfort throughout treatment.