In that instant, a shrouding silence enveloped the room. The one that first broke the silence is Satori.
"Reimu, 'happiness~!' is not something that's scary!" "Yu yu! That's not true! 'happiness~!' is really scary!"
So that is true. Reimu was feeling afraid the whole time. Conversely, according to Reimu this is 'happiness~!'.
"If you can obtain 'happiness~!', then you will be able to live normally. If not, then the bean paste in your body will become scattered and broken, and you will be in a lot of pain!" "Try to remember easy Reimu. 'Happiness~!' must be something that you can take it very easy with. Satori will let you remember all your easy up until this point. In the depths of Reimu's dim memory it will be there, the sole 'happiness~!' event."