How to get to Sendai
It is worth checking if the airline company of your choice has direct flights to Sendai.

To City Center from the airport , from other cities by car , from Tokyo by train

If your flight schedule is tight, consider the possibility of staying at a hotel in Narita overnight before planning the continuation of your travel to Sendai or home.
With advance reservation, you should be able to stay overnight for around $60-70/person including breakfast.
If you do so, I recommend Narita View hotel for its price and service. It costs about 6,600 yen. Have breakfast included at booking.
I will eventually put a more appropriate hyperlink to JTB (Japan Travel Bureau) than is provided here for now.

This page administered by Shinichi Watanabe