I'm here! It's Jeanne Alter (The one with a black color scheme) and the normal Jeanne (lighter/no color). So it's Jeanne Alter x Jeanne or Avenger x Ruler.
Hey, it's Ib! Didn't expect to ever see that game of all things here... I guess it isn't an entirely unreasonable ship though depending on how you look at it.
Yeah...you need to know how the "gameplay" works in Fate/GO to understand this one. A quick way to understand this is that Jeanne Alter (black clothed one) doesn't think Jeanne is powerful enough to be her ally in the party and wants her to at least have the attribute of "dragon", and so Jeanne wears that dragon kigurumi.