Wakana's return to her own time doesn't have the intended result. Yuito and Kasane have a new and complex entanglement to deal with. Yuito meets Kaito for what could be the last time, but will he give him what he wants? Fubuki comes to the rescue.

A shock awaits Yuito and company as they confront Karen at the mausoleum. Will they be able to convince you to help? Yuito and Kasane deal with their regrets about what happened to Nagi and Naomi, and must take drastic measures in an attempt to save the world.