Dunno, it seems that with this and last chapter the mystery girl is changing Keima's experience of Maijima to a time long past- you'll recall in the previous chapterin his vision the building disappeared and there were rocks on the ground. In this chapter it's a girl's school and the stairs are collapsing from under his feet. I think then that the theater where Haqua's runaway spirit was found will come into play again, given how much historical information was thrown at us that arc.
Also I bet Lune's still alive somewhere...
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