User blog comment:Mamizou Futatsuiwa/Summon Maiden from Rare summon/@comment-128.101.180.120-20140514193905

Serin, Bayley, Lico, Cayena, the lightning and light battle maidens, Oboro, Alma, Galant, Zeln, Nemia, Stya, Atro, Magress, Vargas, Eze, Selena, Lance, and Keymaster Gilnea are all of the non-common units than do not appear in rare summon.