I just finished watching Banana Fish. While I have not read the manga, the show was great. The government experiments, literary references, mafia corruption and revenge themes were intriguing. But I don't understand the yaoi fandom for this show. Anything sexual that the show has is portrayed in an ugly and shocking manner. I honestly don't know why people drool over Ash and Eiji. Ash is an emotional and mental wreck, while Eiji comes across as a whiny little bitch at times that involuntarily causes trouble for him. He seems like a puppy that is happy to have received some attention. Then again, he did end up being a close friend to Ash without wanting anything in return.
MAPPA worked on this anime, but they have an animated studio ID that has motorcycles riding off into the distance. Wit Studio uses the same ID. Are they somehow related?