Thank heavens for PGSM Today! They clear up all my questions. Rina Koike and Mew Azama did appear together Pressure Battle, a quiz show that challenges entertainers on their kanji skills.
AND PGSM Today also mentions that Ayaka Komatsu and Aya Sugimoto will be appearing together in a future episode. Based on this evidence, I am choosing to believe somebody on that show is a PGSM fan.