I'll venture a little speculation, if you'll allow me.
and still, what options could Lethe have?
she's a "virtual girl" after all. She exists only in the dream world, doesn't she? but she's afraid that she'll be forgotten.
yes. it will be interesting to see the script's solution regarding her.
well, if I were to determine the course of events, I would agree to make a gentleman's agreement with Lethe - when the Dikalia girls go to bed, they all end up in Lethe's world in the roles in which we know them in Leta's world. but with one exception - in the morning they all wake up, so to speak, Lethe lets them go in the morning. and thus Lethe won't be forgotten, and there won't be a need to look for the girl's body for her (I wonder if anyone can imagine such a thing? to find a living body of a girl who has no soul... no, of course, in the VN "My Best Deal" the MC was transferred to the body of a young man who fell into a coma and his soul went to the world of the dead)