①The mayor of the municipality (including the head of a special ward; the same applies hereinafter) may, even before the day on which the provisions set forth in Article 1, item (ix) of the Supplementary Provisions come into effect (referred to as the "item (ix) Effective Date" in the following Article), take the preparatory acts necessary for the implementation of the work prescribed in Article 17 (limited to the part pertaining to item (v) and item (vi)) of the Residential Basic Book Act as revised by the provisions of Article 2 (referred to as the "New Residential Basic Book Act" in the following paragraph and the following Article).

②The mayor of the municipality, the prefectural governor, and the Japan Agency for Local Authority Information Systems may, even before the day on which the provisions set forth in Article 1, item (x) of the Supplementary Provisions come into effect (referred to as the "item (x) effective date" in the following Article and Article 5 of the Supplementary Provisions), take the preparatory acts necessary for the implementation of the work prescribed in Article 17 (limited to the part pertaining to item (iii), item (iv), and item (vii)) and Chapter IV-3 of the New Residential Basic Book Act.

①The provisions of Article 15-2 of the New Residential Basic Book Act also apply to a certificate of residence that the mayor of the municipality removed before the day on which the provisions set forth in Article 1, item (ii) of the Supplementary Provisions come into effect (hereinafter referred to in this Article as the "item (ii) Effective Date"), or a certificate of residence before re-preparation in the case of the re-preparation of a certificate of residence, that is actually retained by the mayor of the municipality at the time the provisions set forth in that item come into effect.

②With regard to a removed certificate of residence (meaning a removed certificate of residence prescribed in Article 15-2, paragraph (1) of the New Residential Basic Book Act; hereinafter the same applies in this paragraph) for which five years have elapsed from the day on which the mayor of the municipality removed or re-prepared the certificate of residence pertaining to that removed certificate of residence, the provisions of Article 15-4 of the New Residential Basic Book Act do not apply until the date specified by Cabinet Order within a period not exceeding three years from the date of promulgation.

③With regard to a family register supplement that the municipality concerned (including a special ward; hereinafter the same applies in this paragraph and paragraph (9)) actually keeps as of the item (x) effective date and that pertains to a person who has not been recorded in the basic resident register in any municipality on or after the day on which the Act on the Use of Numbers to Identify a Specific Individual in Administrative Procedures comes into effect, the mayor of the municipality is not to enter the matters listed in Article 17, item (vii) of the New Residential Basic Book Act, notwithstanding the provisions of Article 17 of the New Residential Basic Book Act, until the resident record code prescribed in Article 7, item (xiii) of the Residential Basic Book Act is entered in the certificate of residence pertaining to that person under Article 30-3, paragraph (1) of the Residential Basic Book Act, and the notice under Article 19, paragraph (1) of that Act is given, on or after the item (x) effective date.

④With regard to the application of the provisions of Article 20, paragraphs (2) and (5) of the New Residential Basic Book Act during the period from the item (ix) Effective Date until the day preceding the item (x) effective date, the term "a copy of the family register supplement from which the entry of the matters listed in Article 17, item (vii) is omitted" in paragraph (2) of that Article is deemed to be replaced with "a copy of the family register supplement", and the term "and the matters listed in item (vii), and" in the row for Article 12, paragraph (5) of the table in paragraph (5) of that Article is deemed to be replaced with "the matters listed in, and".

⑤The provisions of Article 21 of the New Residential Basic Book Act also apply to a family register supplement that the mayor of the municipality removed before the item (ii) Effective Date, or a family register supplement before re-preparation in the case of the re-preparation of a family register supplement, that is actually retained by the mayor of the municipality at the time the provisions set forth in Article 1, item (ii) of the Supplementary Provisions come into effect.

⑥With regard to a removed family register supplement (meaning a removed family register supplement prescribed in Article 21, paragraph (1) of the New Residential Basic Book Act; hereinafter the same applies in this paragraph) for which five years have elapsed from the day on which the mayor of the municipality removed or re-prepared the family register supplement pertaining to that removed family register supplement, the provisions of Article 21-3 of the New Residential Basic Book Act do not apply until the date specified by Cabinet Order within a period not exceeding three years from the date of promulgation.

⑦With regard to the application of the provisions of Article 21-3, paragraphs (2) through (5) of the New Residential Basic Book Act during the period from the item (ii) Effective Date until the day preceding the item (ix) Effective Date, the term "a copy of the removed family register supplement from which the entry of the matters listed in Article 17, item (vii) is omitted" in paragraph (2) of that Article, and the term "a copy of the removed family register supplement showing only the matters listed in Article 17, item (ii) through item (vi)" in paragraph (3) of that Article, are deemed to be replaced with "a copy of the removed family register supplement"; the term "as, prescribed in that paragraph" in paragraph (4) of that Article is deemed to be replaced with "as,"; the term "through paragraph (7)" in paragraph (5) of that Article is deemed to be replaced with "through paragraph (4), paragraph (6) and paragraph (7)", the term "through paragraph (5)" is deemed to be replaced with ", paragraph (3) and paragraph (5)", and the term "through paragraph (9)" is deemed to be replaced with "through paragraph (6) and paragraph (9)"; and the term "Article 12-3, paragraphs (8) and (9)" in the row for Article 12-3, paragraphs (8) and (9) of the table in paragraph (5) of that Article is deemed to be replaced with "Article 12-3, paragraph (9)".

⑧With regard to the application of the provisions of Article 21-3, paragraphs (2) and (5) of the New Residential Basic Book Act during the period from the item (ix) Effective Date until the day preceding the item (x) effective date, the term "a copy of the removed family register supplement from which the entry of the matters listed in Article 17, item (vii) is omitted" in paragraph (2) of that Article is deemed to be replaced with "a copy of the removed family register supplement", and the term "and the matters listed in item (vii), and" in the row for Article 12, paragraph (5) of the table in paragraph (5) of that Article is deemed to be replaced with "the matters listed in, and".

⑨With regard to a person who is recorded in the family register supplement actually kept by the municipality concerned as of the item (x) effective date and who has not been recorded in the basic resident register in any municipality on or after the day on which the Act on the Use of Numbers to Identify a Specific Individual in Administrative Procedures comes into effect, the mayor of the municipality is to notify the prefectural governor of the family register supplement identity confirmation information prescribed in Article 30-41, paragraph (1) of the New Residential Basic Book Act pertaining to that person (excluding the matters listed in Article 17, item (vii) of the New Residential Basic Book Act), notwithstanding the provisions of Article 30-41, paragraph (1) of the New Residential Basic Book Act.

⑩A notice under the preceding paragraph is deemed to be a notice under Article 30-41, paragraph (1) of the New Residential Basic Book Act.

⑪With regard to the application of the provisions of Article 32 of the Residential Basic Book Act during the period from the item (ii) Effective Date until the day preceding the effective date, the term "preparation" in that Article is deemed to be replaced with "preparation, and the retention of removed certificates of residence and removed family register supplements".

⑫With regard to the application of the provisions of Article 43, item (ii) (limited to the part pertaining to sub-items (c) through (h)) of the New Residential Basic Book Act during the period from the item (ii) Effective Date until the day preceding the item (x) effective date, the term "identity confirmation information, or family register supplement identity confirmation information pertaining to a notice under Article 30-41, paragraph (1)" in sub-item (c) and sub-item (d) of that item, the term "identity confirmation information or family register supplement identity confirmation information" in sub-item (e) of that item, and the term "identity confirmation information, or family register supplement identity confirmation information pertaining to a notice under Article 30-42, paragraph (1)" in sub-item (f) of that item, are deemed to be replaced with "identity confirmation information"; the term "or computer processing, etc. of the received family register supplement identity confirmation information, etc." in sub-item (g) of that item is deemed to be replaced with "computer processing, etc. of", and the term "recipient, or a family register address information recipient prescribed in Article 30-28, paragraph (1) as applied mutatis mutandis pursuant to Article 30-44-12" is deemed to be replaced with "recipient"; and the term "or computer processing, etc. of the received family register supplement identity confirmation information, etc. prescribed in Article 30-28, paragraph (1) as applied mutatis mutandis pursuant to Article 30-44-12" in sub-item (h) of that item is deemed to be replaced with "computer processing, etc. of".

With regard to the application of penal provisions to an act committed before this Act (or, for the provisions set forth in the items of Article 1 of the Supplementary Provisions, those provisions; the same applies in Article 9, paragraph (2) of the Supplementary Provisions) comes into effect, the provisions then in force continue to govern.

Beyond what is provided for in these Supplementary Provisions, the transitional measures necessary in connection with the enforcement of this Act (including transitional measures concerning penal provisions) are specified by Cabinet Order.

②The government is to, beyond what is provided for in the preceding paragraph, with a target of three years after this Act comes into effect, review the status of enforcement of the respective Acts as amended by this Act, and, when it finds it necessary, is to take the necessary measures based on the results of that review.