Autumn has arrived at Verbena Academy.
This summer, Lithia was able to become lovers with Raito Aioi, who had dreamed of her since he was a child. There was a figure of Lithia, the princess of the divine world. She experienced the autumn of the human world and was immersed in a melancholic mood.
"I know what Raito and I need the most now... and that's a concubine!"
When love comes to fruition as love and becomes marriage. Whether or not they should have a wedding ceremony with Raito...Lithia is indulging in future delusions. While worried about the difference in values between humans and the divine world, which is polygamy. After all, if you want to get married, polygamy may be better!?
Unknown to Raito, the search for Lithia's wife begins!
On the other hand, a mysterious airplane suddenly appears on the grounds of Verbena Academy!
"Raito-kun's father, maybe he's alive...?"
A mysterious journey begins at Verbena Academy in the fall, triggered by the sudden appearance of an airplane and the girl who lost her memory as a passenger...!!