https://en.wikipedia.org/wiki/Age_of_consent_in_Asia#Japan

>The age of consent in Japan is 16 years old, according to Articles 176 and 177 of the Penal Code (as amended in 2023).

>In the original 1907 Penal Code, the age of consent was 13 years old, which by 2023 was among the world's lowest.[85] Article 176 ("Forcible Indecency") established a penalty of 6 months to 10 years of imprisonment for "indecent acts" with males and females under 13 years old, and Article 177 ("Rape") established a minimum sentence of 3 years for sexual intercourse with females under 13.[86] In 2017, Article 177 was amended to specify vaginal, anal, and oral intercourse, to apply to all persons instead of females, and to increase the minimum sentence to 5 years.[87][88] In 2023, the two articles were amended to raise the age of consent from 13 to 16 years old. An exception was included for sexual acts involving persons aged 13 to 15, by which the older partner is only subject to penalty if five or more years older. The amendments were part of a larger reform of Japan's sex crime legislation.[9][10]