As the IJN took over all surviving U-Boote in Far East waters in May 1945 including two IXD2s you have two Japanese subs directly out of the UBM box. To use as full IJN subs does require some work however: crew names changed, Japanese speechpack etc.
In reality the subs concerned saw no operational use before the Tenno signed on the dotted line- but it is a "relatively simple" start to IJN sub missions.
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