Scaramouche has done a lot of awful things, but I don't think rummaging through Kazuha's stuff was one of them. This video has a quick recap and summary of the main Irodori event quest plus two small theories.
*CITATIONS AND FURTHER READING*
Husk of Opulent Dreams
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Shakkei Pavilion
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Rather Aged Notes
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Katsuragikiri Nagamasa
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The Palace Dyed in Black
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Musou Isshin
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Raiden Gokaden & Isshin Art
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