Yui sees Tamahome
and Miaka together in the 'real world'.
Volume: # 12
Episode: # 46
Back in the "real
world", Yui visits Miaka to talk to her about everything that has
occured since the two came across the Universe of the Four Gods.
Before she even enters the apartment building, she sees Miaka and
Tamahome in an embrace through an apartment window. Yui realizes
that she has failed to separate the two and thus decides on a
fateful decision.