Monthly bump. Still looking!
Probably an obvious question, but have you tried asking someone who has/had the other copy listed for sale if they have access or can find you the 2nd stage booklet? I found someone who sold the first one, you already have, listed in mercari’s japan server. Maybe try reaching out to them? I see that you used google to search a mercari listing up, but maybe if you can reach out to a seller from Japan directly whom might aide you.
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