The world in the moon begins with becoming Morgan’s husband!

As a Master who traveled through time, Ian is not that familiar with Chaldea.
But it doesn't matter, he has a special ability that other masters don't have--that is, a simulator.
This allowed him to leave his own mark on history.
——Although it’s not normal.
[You became the husband of a demon concubine, but at the same time you cheated on the Holy Knight King disguised as a man. Britain was in trouble because of you. 】
[You took control of Tamamo Mae, and as a master, you allowed Minamoto Yorimitsu to witness what it means to physically subdue demons. The ghosts of the Heian era all avoided you. 】
[You left Medusa haunted, and the whole of Greece echoed that she would take off her blindfold the moment she reunited with you. 】
[You are Jeanne d'Arc's soul mate. Only you know how to make this usually very reserved saint achieve relief and relaxation in every sense. 】
Ian has to say that this understanding simulator is really suitable for him.
Solving all problems in his favorite way.
everything is fine.
Until one day, the moment they came to him as servants.
Only then did Ian realize that he had incurred a lot of romantic debts.