As long as they make it a rotation of metal, gold, and candy I will be fine with it.
If they wanna be cheap bastards, make it 1 candy per run, and limited number of runs.

Also 500 scrap, or 500 gold... thats nothing. Either double, or half the oil cost.

Honestly I would like to see Candy special missions. they rotate and are accessible twice per week. Instead of 5 popups on your map, make it one always on the same space (put these daily missions on one of the small islands that are off the main map), and let it have 5 stages. Clearing each gives you 1 candy, and after you clear all five you are done and have to wait for the next reset (twice each week).

This would give us slow but reliable way to get some extra Candy, considering you get one bundle from PoC and 5 from daily missions.
And seeing as its the only way to access the H content, as was already discussed - the point why this game is on Nutaku in the first place, and yet the H content is insanely gated and hard to access, this would help a bit.

Or just honestly make them repeatable 200 oil missions, 1 candy per run. I mean there is no point in gating the H content any more than it already is... especially with the lack of anything else going on in the game.