Not sure if we had a thread for this book yet. Reposting from the discussion thread:
They've released the cover for the "Konoha Hiden",
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木ノ葉秘伝: 祝言日和
Konoha Hiden: The Weather for a Wedding Celebration
Literally it's like 'Wedding Celebration' + 'Weather Conditions'
^^^^^According to OrganicDinosaur on NF