Dagger: Yuushiki no Ikusabito

Several days after the events of Frontlines of the War...

Tisto and Aisis visit the spiritlands to repay their spared lives.

Waiting for them is a room and a culture unlike any ever seen before,
and the bewildered duo are given a rough welcome and a request:

"Our world thrives on help from the humans.
For that reason, as necessary, we must submit to them."

[From DLsite English]