Y'know, restarting Extra (I'd only previously played about 1 hour of it, and then I decided I ought to replay it, but ran into some problems and lost my savegames and...)
Anyway point is, I decided to just go with the flow and try to see how things would turn out, and not deliberately go for any heroine... and then
THIS happens:
Screw this, time for Meiya route.
...and yes, I wouldn't mind waking up next to her-
*Goose is killed by Tsukuyomi sisters*