The anime's offcial site is named "Aninana" (ア二ナナ) which is extremely simmilar to "Ainana" (アイナナ, Ainana), exceptes there's an added "N" at the start making it "ani" which is the most common abbreviation for Anime.
The anime website is ran via wordpress. (Proof shown to the right)
January 17, 2019 - When the second half of Before the Radiant Glory (Vibrato) was about to be released, YouTube had a glitch where the introduction for Vibrato appeared on BTS's YouTube channel description. (Proof shown to the right)