What's written on Reimu's shirt? It seems to make Marisa quit shocked.

It says something like "That was above my expectations!". The idea is that both Marisa's and Reimu's shirts have famous niconico phrases written on them. Literally this one translates as "I had no such idea" (as in, no idea that this video was so epic). Sort of like "I don't even..." for western internets.

Translation bump anyways?

Here you go