メカクレ彼女と寝取られの呪い

Eddy's girlfriend Fia has an incurable illness,
and they make a pact with a witch to save her life.
However, in exchange, she is cursed with a spell of cuckoldry.

From there, the country is enveloped in war,
and they must explore an unknown land to overcome the curse.
Can they return to normal life?
-DL Site