Rika and Emi are colleagues and on good terms. Rika often tries to ask Emi out for a meal, although she was often met with rejection during the period Emi was observing Maou. She is Emi's closest friend in Japan.
Rika developed an attraction for him after their conversation at SFC. Ashiya seems to be oblivious to her affections, but considers her a friend he can ask for advice.