Two characters sharing common ground through a unifying element that's effectively exclusive to just themselves. A special bond no one else is a part of, as if they're operating in their own universe.
I'm excluding works where the unifying element is heavily based on the establishment of particular character dynamics (e.g. Giji Harem which is driven by around Rin's acting or Shuukura which is driven by the "purchase" between the two characters).
Recent Interest Stacks
Itano Circus is a recurring aerial shot popularized by and named after animator Itano Ichirou who used it in the Macross franchise's aerial and space battles. It is both a signature shot of said franchise and has appeared in many anime unrelated to it. It typically plays out like this: a massive barrage of homing projectiles are fired at a target, and a mini chase starts with the target evading the projectiles. This is a list of anime featuring such a shot.
An example from Macross Plus, starts at 0:16,
https://www.sakugabooru.com/post/show/46469
Part 1:
https://myanimelist.net/stacks/80375
Part 2:
https://myanimelist.net/stacks/80386
just beautiful art from BL stuff that's candy for my eyes, nothing to do with whether the story is good or bad (because i'll admit there's some bad ones here)
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part 1 of this stack: https://myanimelist.net/stacks/42294
part 2 of this stack: https://myanimelist.net/stacks/43236
part 3 of this stack: https://myanimelist.net/stacks/44352
part 4 of this stack: https://myanimelist.net/stacks/54472
*i have a non-BL version of this list as well: https://myanimelist.net/stacks/42518
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more that's not listed on MAL:
ghosts, vampires, demons, angels
Sekai wo omoshiroku suru no wa
Wareware wareware wareware wareware
Wareware jishin da
"Surrealism is an art and cultural movement that developed in Europe in the aftermath of World War I in which artists aimed to allow the unconscious mind to express itself, often resulting in the depiction of illogical or dreamlike scenes and ideas."
