Koseki
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A koseki or family register is a Japanese family registry. Japanese law requires all Japanese households to make notifications of their vital records to their local municipal authority.
Reproduction of a koseki certificate printout
Cover of the Register of Imperial Lineage (Kōzokufu) that handle the current imperial reign (126th emperor)
Registered domicile
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In Japan, a registered domicile is the place where a Japanese citizen is considered to have their roots. It determines the city/ward/town office where their koseki is kept.
Koseki
…The following items are recorded in the koseki. (Law of Family Register, (戸籍法, kosekihō), articles 9 and 13.) (header) registered domicile (honseki) (header) family name and given name of the "head of the koseki", i.e. the first person shown on the koseki. This family name will be shared…
'A Japanese passport, displaying a 'registered domicile' field in lieu of 'place of birth'.