What is the relation between Strike The Blood and Strike The Blood EX?


I have read that in _Strike The Blood EX_ , Kojou seems to have two children,
so _EX_ has to be set in the future.

Is it the future of the "world" the story takes place or is it the "future"
shown at the end of the anime where Reina came from (you can see Kojou's
daughters Reina and Moegi)? Or is _EX_ maybe only the name of the last arc in
the anime (where Reina appears)?




Well, during the last episode of the anime (episode 24), a girl suddenly
appeared out of nowhere. She looked exactly like Yuukina (but her busts were
larger) and she had eyes like Kojou and was a vampire. It is later revealed
that she is Reina Akatsuki, daughter of them, and she had come in past (time
travelled) to kill a dangerous human-made dragon... When she got back in her
time, it is revealed that Kojou has another daughter named Moegi, but from
Asagi..

This is whole is called _Strike the Blood EX_ , I guess

