Why must I go to your time?

Feudal Era, time long forgot.
A modern day young teenager is able to travel between times & space.
Only this time as a young adult, she takes someone back to her present time that is special, that belongs
to a Demon War Lord from the Feudal times. Only to leave the special someone in her time...
That special someone is a orphaned child ( Rin)..But now Rin can't get back to her Feudal Era, to her Demon Lord.
Wait for it...wait for it, Rin can go back...but not without the help of Ms.Carswell..Now times are closed to the young teacher. She now is stuck in a time long forgotten.