最終回
「お別れだ、姫…」
「そんな…！行かないで勇者様！！」
「私の役目は終わったんだ… これからこの世界を守る新たな勇者は、君達だ」
(https://twitter.com/isiyumi/status/1143841321771126786)

新幹線や列車型勇者を召喚した場合、世界中にレールを敷設するエピソードもあるな…
(https://twitter.com/isiyumi/status/1143844097632829440)

Artist provided further commentary on multiple subsequent tweets.

Final Episode:
"Farewell, Princess..."
"You can't—! Please don't go, Brave Hero!!"
"My role has ended... from now on, the new heroes who will defend this world... will be you."
(https://twitter.com/isiyumi/status/1143841321771126786)

If they summoned a Yuusha Hero based on a bullet train or some other train... think there would probably be an episode about laying down rails in this world...
(https://twitter.com/isiyumi/status/1143844097632829440)

Artist provided further commentary on multiple subsequent tweets.