Kinda looks like of the peepers here, Reimu is the most pure-hearted. Her expression just seems to be more of an "aww... look at them," while Marisa's is "this is getting good" and the trio "look at how embarrassed she is!"
Today's Punishment Game:
Seija is to give a heartfelt *declaration of love*!Am I to treat these as the feelings of an Amanojaku!?
What you say and what your face says are worlds apart!!I, well, that is...
I want you to go and be with the person you love...I'm a horrible person, and I want you to die far away from me... that's why-