Replayed some Sara's events to refresh my memory about her story and her ex teacher, and found some subtle foreshadowing about her
blackouts in
Tell Me When.
But, I still feel kinda odd that her ex teacher didn't leave the picture right when Sana's older brother was born; no he stuck around and knocked her up the second time, then he left; having bastard kids wasn't what drove him away?
(I was thinking perhaps it was not like he ended the relationship with her, but was actually dead because he was assumed to be Nozomu, but timeframe-wise this wasn't coherent)
Maybe Sara brought up the possibility of settling down with him
only when she got knocked up the second time; and this would mean before that this asshole was completely fine with keep having sex with Sara despite already giving her one child
.
Then again if blackouts continuously happened during Sara's high school year then probably the whole story needs to be taken with a grain of salt (almost everything with this game is I suppose)