YGO: Broken

...

There's nothing you can do for them
They are the force between
When the sunlight is arising

There's nothing you can say to him
He is an outer heart
And the space has been broken (down)
...

I'm sorry, I'm rewatching Yu-Gi-Oh! Duel Monsters and all I seem to be able to produce is (angsty) Polarshipping art.
Because noone can tell me that Mai's PTSD will just go byebye after DOMA (especially with her being her own worst enemy, constantly feeding it).
The 4th season (where I'm currently at) already hinted at peaceful nights being a thing of the past for Mai after Battle City. Even much later (in my Polarshipping-induced future), there will still be those nights where she wakes up from a cocktail of nightmares that accumulated over the years. Katsuya usually wakes up with her, but falls asleep again before she does, without being able to do anything about it. Or for her.

"I'm sorry... in the end, I couldn't do anything for you." (Jounouchi; Episode 173)