The law as Act on the Arrangement of Related Acts to Promote the Use of Information and Communications Technology in Civil Procedures, etc. (Act No. 53 of 2023) leaves it, with the words it changes marked.
The main text is read a page at a time: a chapter to a page, and a long chapter in runs of articles. The whole main text, and the supplementary provisions and appended tables this amendment changes. Those it leaves untouched are on the page for the text in force.
An adjudication case for the establishment of a duty to support (meaning an adjudication case regarding the matters set forth in Appended Table 1, row (84)) is subject to the jurisdiction of the family court which has jurisdiction over the place of domicile of a person who is to be a person under a duty to provide support (in the case of a petition for the establishment of a duty to support for two or more persons, one of such persons).
An adjudication case for the revocation of the establishment of a duty to support (meaning an adjudication case regarding the matters set forth in Appended Table 1, row (85)) is subject to the jurisdiction of a family court that has made a ruling of the establishment of a duty to support (if the court in charge of an appeal has made a judicial decision of the establishment of a duty to support, the family court that is the court of first instance).
An adjudication case for a determination of the order of support and for a change or revocation of such determination (meaning an adjudication case regarding the matters set forth in Appended Table 2, row (9)), and an adjudication case for a determination of the extent or method of the support and for a change or revocation of the determination (meaning an adjudication case regarding the matters set forth in Appended Table 2, row (10); the same applies in Article 184-2, paragraph (1)) are subject to the jurisdiction of the family court which has jurisdiction over the place of domicile of the respondent (in the case of a petition filed against two or more respondents, one of such respondents).
In the case of filing a petition for the establishment of a duty to support by uniting it with a petition for the appointment of a custodian under the provisions of Article 23-2, paragraph (2), item (iv) of the Act on Medical Care and Treatment for Persons Who Have Caused Serious Cases Under the Condition of Insanity (Act No. 110 of 2003), it may be filed with the family court which has jurisdiction over the place of domicile of the subject prescribed in Article 2, paragraph (2) of the same Act.
When making the rulings set forth in the following items, the family court must hear statements from the persons specified respectively in these items (excluding the petitioner):
a ruling of the establishment of a duty to support:the person who is to be a person under a duty to provide support; and
扶養義務の設定の審判 扶養義務者となるべき者
Article 184, paragraph (1), item (ii)
a ruling to revoke the establishment of a duty to support:the person entitled to support.
扶養義務の設定の取消しの審判 扶養権利者
Article 184-2第百八十四条の二
Orders to Disclose Information（情報開示命令）
Article 184-2, paragraph (1)
In an adjudication case for a determination of the extent or method of support, and for a change or revocation of the determination, a family court may, when it finds it to be necessary, upon petition or by its own authority, order a party to disclose information regarding the status of their income and assets.
When a party who has been ordered to disclose information pursuant to the provisions of the preceding paragraph fails to disclose the information without justifiable grounds or discloses false information, the family court punishes the party by a non-criminal fine of up to 100,000 yen.
In a ruling of a determination of the extent or method of support, and of a change or revocation of the determination, the family court may order a party to pay money, deliver an object, perform an obligation to register, or perform any other act.
An immediate appeal may be filed against the rulings set forth in the following items by the persons specified respectively in these items:
次の各号に掲げる審判に対しては、当該各号に定める者は、即時抗告をすることができる。
Article 186, paragraph (1), item (i)
a ruling of the establishment of a duty to support:the person who is to be a person under a duty to provide support (excluding the petitioner);
扶養義務の設定の審判 扶養義務者となるべき者（申立人を除く。）
Article 186, paragraph (1), item (ii)
a ruling to dismiss a petition for the establishment of a duty to support:the petitioner;
扶養義務の設定の申立てを却下する審判 申立人
Article 186, paragraph (1), item (iii)
a ruling to revoke the establishment of a duty to support:the person entitled to support (excluding the petitioner);
扶養義務の設定の取消しの審判 扶養権利者（申立人を除く。）
Article 186, paragraph (1), item (iv)
a ruling to dismiss a petition for the revocation of the establishment of a duty to support:the petitioner;
扶養義務の設定の取消しの申立てを却下する審判 申立人
Article 186, paragraph (1), item (v)
a ruling of a determination of the order of support, and of a change or revocation of the determination, and a ruling to dismiss the petition:the petitioner and the respondent; and
a ruling of a determination of the extent or method of support, and of change or revocation of the determination, and a ruling to dismiss the petition:the petitioner and the respondent.
Provisional Orders Sought by Designating an Adjudication Case Regarding Support as a Case on the Merits（扶養に関する審判事件を本案とする保全処分）
Article 187, paragraph (1)
When a petition for adjudication or mediation regarding the following matters is filed, and when it is necessary for the preservation of a compulsory execution or the prevention of an imminent danger to a person concerned with the case, the family court (or a high court in the case set forth in Article 105, paragraph (2)) may, upon the petition of the person who has filed the petition, issue a ruling of provisional seizure, provisional disposition, or any other necessary provisional order by designating the adjudication case on the matter as a case on the merits:
a determination of the order of support, and change or revocation of the determination; and
扶養の順位の決定及びその決定の変更又は取消し
Article 187, paragraph (1), item (ii)
a determination of the extent or method of support, and change or revocation of the determination.
扶養の程度又は方法についての決定及びその決定の変更又は取消し
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The day a law or an amendment starts to apply. It is often months or years after promulgation, so that people have time to prepare. The Ministry of Justice's English usually says a law "comes into force" or "comes into effect", and sometimes calls the day its "enforcement date". Its "enforcement" more often means the word's other sense, carrying a law out, as in an Order for Enforcement (施行令), the Cabinet Order (政令) that sets out the details for carrying out an Act.
Rules made by the Cabinet to carry out the Constitution and Acts. A Cabinet Order cannot impose duties, restrict rights or set penalties unless an Act delegates that to it.
The Ministry of Justice's English of this passage has a slip, so the English shown is this site's correction of it. The Ministry printed:
When a petition for adjudication or conciliation regarding the following matters is filed, and when it is necessary for the preservation of a compulsory execution or the prevention of an imminent danger to a person concerned with the case, the family court (or a high court in the case set forth in Article 105, paragraph (2)) may, upon the petition of the person who has filed the petition, issue a ruling of provisional seizure, provisional disposition, or any other necessary provisional order by designating the adjudication case on the matter as a case on the merits:
Japanese Law Translation, Ministry of Justice
Translates the law as amended by Act No. 34 of 2019 (令和元年法律第三十四号)