I didn't know you were serious about that... I should think of some serious answers then.
You have said before, that moonman is sopposed to save this world with a "star machine".
It sounds like this is a story about the moon setting, kind of the opposite of a moon rise.
How about a longer title? Under the light of the moon/ Moon shine / moon set / setting moon.
Under the setting moon.
Moon story still sounds the best to me.. I dont remember who said it.