I always thought this series would end after one thing but they continually add separate arcs (which is a plus imo) which doesn't detract from the overall story line. Would appreciate more background info though, which I assume will be covered later.
Watched it last night. Was a good episode
Glad Enju was fine or else I would or dropped the show right there.
I agree with you on the development between Rentaro and sensei though. Would be cool to know her story and more about their relationship.