Ren has to give pause at Naoto's statement, past lives? The cogs of his mind were silently turning, wondering if these four really could be... But almost immediately, as Sakuya produced that butterfly-shaped crystal— something seemed to resonate within him. A flash of something, a memory? But.... why should he be thinking of the interrogation now of all times?

Almost instinctively he reached for that one in particular, but stopped himself mid-way, glancing first at Sakuya himself— then towards their sensei. Should he... be taking this? Was she serious?

"These crystals... are the key?"