The Japanese were excited about the events of Pearl Harbor.
The primary source that I found translates from a Japanese newspaper that says “What an uproar! Japan’s Imperial Forces got things off to a quick start with one splendid strike then another in historic surprise attacks on Pearl Harbor, where the bravado of the US Asia fleet met with sudden defeat, and off the Malaya Coast, where the main forces of the British Asia fleet were utterly annihilated” (Gilderlehrman).
This evidence “What an uproar! Japan’s Imperial Forces got things off to a quick start with one splendid strike then another in historic surprise attacks on Pearl Harbor, where the bravado of the US Asia fleet met with sudden defeat, and off the Malaya Coast, where the main forces of the British Asia fleet were utterly annihilated” shows that the Japanese were excited by their win against Pearl Harbor because the Japanese newspaper says things like what an uproar, and splendid and it shows that they are happy and excited about the win.
The people at Pearl Harbor on December 7, 1941, were terrified and confused when Japan attacked.
“How can I write at such a time? I have to do something because I can see the smoke pouring up into the air from Pearl Harbor and the sound of the guns and the bombs bursting in the water right before us keeps me in such a nervous state that I must do something. John is at Pearl Harbor. He left early this morning because he was supposed to go today—they have been rushing so. I know they have hit places there because I see so much, much smoke.” -Beth Slingerland, Eyewitness to a "Day of Infamy": Commemorating Pearl Harbor
Many people there were surprised and shocked at what they saw at Pearl Harbor. There were a lot of people inside Pearl Harbor when it happened. For anybody outside were nervous, scared, and worried. Some of them also went to help the people inside Pearl Harbor.