This question applies both during direct negotiations with the Americans, and also among themselves. Perry's own sponsored account of what happened is littered with descriptions of how the Japanese were bending over backwards in niceties, almost always smiling and jovial. Surely this was not the case? Or maybe it was but only when he or his crew were around? Obviously they weren't happy about being invaded. I've read quite a lot about this, including the sorts of discussions going on behind the scenes among the Japanese, but I've struggled to find much written by the Japanese themselves about what was happening.
Please delete this comment if it does not meet the academic standard of this subreddit (as for other areas, I'm sure it's not. I'm also specialized neither in this area nor in this period.).
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There is actually counterpart of Perry's narrative in Japan, minutes within the contemporary goveners, titled as 'Bokui Ohsetsu-Roku (The record of how we coped with the American-Barbarians [sic])'. While considerable amounts of literatures for this negotiatiion between Perry and Tokugawa Shogunate and its aftermath in Japanese has culminated especially since 2003, the 150th anniversary of his visit in Uraga, this primary sources is said to be relatively not so known out of the limited circle of the academics (but I'm not in position to judge whether this catchphrase of the modern translation is really so or not). I myself haven't heard about the existence of this primary source.
This primary source has been just translated in modern Japanese:
Modern Japanese Translation of Bokui Ohsetsu-Roku, trans. and annotated by Kenji MORITA. Tokyo: Sakuhin sha, 2018.
The standard study of Japanese historiography for this topic has been also translated in English, but it seems not to be known so widely (due to its publisher).
Hiroshi MITANI. Escape from Impasse: The Decision to Open Japan, trans. David Noble. I-House Press, 2008. [Japanese Original: Perry Raikoh ('The Arrival of Perry'.). Tokyo: Yoshikawa Kohbun Kan, 2003]
Again, I've not read especially this English translation by myself, so I cannot say it's OK (especially as translation).
The following is the latest literature for the Arrival of Perry rather for the non-specialists.
[Edited]: Italicized all the titles of the books mentioned above. typo fixes.