Points to be aware of when applying for a status of residence of “Spouse or Child of Japanese National”.

The status of residence of "Spouse or Child of Japanese National" can be obtained by a foreigner married to a Japanese national, but it is not always granted.
For example, when a Japanese person marries a foreigner whom he met only once overseas, or when he marries but does not hold a wedding ceremony, officials at the Immigration Bureau might think that the marriage is a fake.
Unless the suspicion is dispelled, the status of residence of "Spouse or Child of Japanese National" will not be granted.
These days, there are many couples who do not hold a ceremony even after getting married, and I think that there are also cases where Japanese people fell in love at first sight while traveling abroad.
In such a case, you should prepare a document that can prove that this marriage is real, such as the dating history leading up to the marriage, and submit it along with a statement of reasons.
Records of LINE and e-mail exchanges between both parties, and photos taken when traveling together are effective as evidence.