From your first Legal Affairs Bureau visit to your new koseki (戸籍) — the whole journey for an Indian passport holder on a single sheet.
Hold a valid status of residence for 5 continuous years (10 from April 2026), at least 3 of them on a work-eligible status. Pay every tax and pension instalment on time, keep traffic violations at zero, and avoid single trips abroad over ~90 days (or ~150 cumulative days/year) that reset the clock. Build everyday Japanese toward JLPT N3+.
The longest phase. Order Japan-side records first, then India-side source documents — every India document needs MEA apostille plus a certified Japanese translation (allow 6–10 weeks). Hand-write your statement of purpose (帰化動機書) and resume in Japanese.
"Good conduct" (素行) and "ability to secure a livelihood" (生計) are judged holistically. Clear any red flag first: tax arrears or unfiled returns, license suspensions, thin or unstable household income, weak Japanese, or undecided dual-citizenship intent.
Submit at your Legal Affairs Bureau in person (no fee). Expect a 30–90 minute interview (with spouse if married), possible unannounced home and workplace visits, and behind-the-scenes verification with your city office, employer and police in both countries. The Minister of Justice decides, effective on the Kanpō (官報) announcement.
India bars dual citizenship — Japanese nationality automatically ends your Indian citizenship (Citizenship Act, 1955, s.9). Surrender your Indian passport for a Renunciation Certificate, then apply for an OCI card as the lifelong-access fallback. Keep Indian returns current and use the India–Japan DTAA.
General information for Indian nationals, not legal advice. Criteria are applied case-by-case by the Legal Affairs Bureau and the Ministry of Justice; day thresholds and document lists are guideline figures and change over time (note the April 2026 rule change). Confirm your specifics with the bureau with jurisdiction over your address and, where the stakes warrant it, a licensed administrative scrivener (行政書士) or lawyer. Sources: MOJ Nationality Q&A; Citizenship Act, 1955 (MHA); Kyodo News, March 2026.