Cerebrum has laid out his terms for saving Luna and Seira to Akari, and the price for their survival is a high one... effectively, he wants to mate with her in return for their safety.
Akari being who she is however, it doesn't take too much hesitation before she agrees and finds herself whisked away to the Clessidra, a kind of limbo between the Astralux and the real world. It's here that