Palate cleanser: This gramma who loves visual novels talking about Steins;Gate. She has timestamped sections where she gushes about her Kurisu and Mayuri figures.
Translation of that overview:
"Darkest Academia" ("Gothic Academia", "Goth Academia") is an aesthetic style used for art, fashion, etc. which incorporates elements traditionally associated with the "Goth" subculture as well as the more modern "Academia" style (itself inspired by a idealization of private schools and the like, possibly originating from the popularity of Harry Potter).
The color palate and accessories most common to art and fashion associated with this aesthetic leans more to the "goth" side, while the fashion styles and architecture in which art/stories are set learns more into the "academic" style.
Ed. Note - Unironically, think Enoby Darkness Dementia Ravenway's fashion sense in My Immortal