Aquanjefferson
Sohara is actually Daedalus, but due to very weak health she died when Tomoki was young and her existence on Earth was erased by Synapse.
Tomoki doesn't remember her and never realized that she replaced herself with a clone, but every time he sees Daedalus in his dreams he wakes up crying.
After Daedalus "wakes up", she sends her clone (Sohara), and later Ikaros, Nymph, Astraea, to Tomoki and asks him to take care of them and make them happy.