In a practical sense,
yes, the "effective" age of consent in most of Japan remains
18, though the legal mechanics have shifted slightly following the 2023 national reforms.
The interaction between the new national law and local prefectural rules creates a two-tiered system:
1. National Penal Code (The "Hard" Floor)
The national age of consent is now
16. This is the threshold for serious criminal charges like "non-consensual sexual intercourse" (statutory rape). If a person over 16 has sex with someone under 16, it is a national felony, regardless of local rules.
2. Prefectural Juvenile Protection Ordinances
Almost all 47 prefectures in Japan (including Tokyo, Osaka, and others) have their own local ordinances. These laws are designed to protect "minors" (defined as those under 18) from what the law deems "indecent acts" or "sexual exploitation."
- The 16–18 Gap: While sex with a 16- or 17-year-old might not trigger a national rape charge, it often still violates these local ordinances.
- Enforcement: These ordinances typically target the adult in the situation. Penalties usually involve fines or shorter jail terms compared to the national Penal Code, but they still result in a criminal record.
- The "Sincerity" Exception: Some local ordinances are slightly more lenient if the relationship is deemed a "sincere" romantic relationship between peers (e.g., an 18-year-old high school senior and a 17-year-old junior), but this is applied inconsistently and is legally risky.
Why the distinction matters
The 2023 reform was less about changing the "effective" age (which was already effectively 18 in most places) and more about
closing a loophole.
Previously, if a prefecture didn't have a strong ordinance, the national floor of 13 applied. By raising the national floor to 16, the government ensured a baseline of protection that cannot be weakened by local politics.
Summary of the "Effective" Age
| Age Range | Legal Status |
| Under 16 | Strictly Illegal. National felony (Penal Code). |
| 16 to 17 | Effectively Illegal. Usually a violation of Prefectural Juvenile Protection Ordinances in most of Japan. |
| 18 and Over | Legal. 18 is now the age of adulthood in Japan (as of 2022). |
So, while the "National Age of Consent" is 16, an adult pursuing someone under 18 in Japan is still very likely to face legal consequences under local protection laws.