"Parallel universes, doppelganger, world lines, reality, truth, jealousy, delusion, adoration, truth, regret, love, dreams, memories, borders. I don't understand it … I just want to see you!" The newly discovered planet Emanon emerges one night at the sky. A weird customer brings Mika a strange present from his journey to "Agartha". And she... is still unable to cope with the sudden parting of Teru.
In Tokyo, the new type of virus called Emanon has spread out. Once people infected by the virus, they lose their most important person's memory. Teru, a guy who spends his life lazily, met his previous girlfriend Mio. But she has infected by the virus and forgot about him. Because of the virus, the world has plunged into confusion and it's been growing as a global pandemic. In the meantime, Teru and Mio restarted their relationship but he also infected and lost the memory about Mio. Tokyo fall into a turmoil and shattered. Teru and Mio ended up in the countryside where they've been before.
A young couple in love prepares to marry, but--contrary to the popular stereotype--the woman develops a classic case of "cold feet" and seeks the advice of an older man. In no position to offer solid counsel since his own marriage is failing, he instead allows her to seduce him.