I managed to complete it all on my own before the end of the year.<img src="https://storage.googleapis.com/oshinoko-5xfoy/oshinoko-5xfoy/admin-console-images/1733827301435_097b03bf-4e1b-4662-974a-05046c434ca6.png" alt="" height="28" width="28" fetchpriority="high" class="mx-2 mt-2 inline-block align-bottom">
The last one remaining was the Nara MEM.<img src="https://storage.googleapis.com/oshinoko-5xfoy/oshinoko-5xfoy/admin-console-images/1733827378905_d4ac08f5-6616-46d6-9f01-7aec60f4cfde.png" alt="" height="28" width="28" fetchpriority="high" class="mx-2 mt-2 inline-block align-bottom">
The total number of cards was 139.
The expected value of completing the 47 types is 208 times, so I was relatively lucky.
The most common overlaps were

Child card gacha for 47 prefectures | 売り切れ's post