Tsuchimi Lovers

The Tsuchimi Lovers are a group named by Mayumi Thyme in episode 6. They refer to the girls she describes as being lovers of Rin Tsuchimi. When she considers whether or not to add Primula, she quips that all the other members of the group know her, and present in the class are Kaede, Nerine and Lisianthus, so it appears that Mayumi did not have Asa in mind.