Nicotine Caffeine's name originated from Adachi's addiction to coffee and cigarettes during the game's development.

"I came up with the name "Nicotine Caffeine" because I was addicted to coffee and cigarettes when we were developing the game. I took the words "caffeine" and "nicotine" and changed them to kanji characters. I no longer smoke cigarettes."
Contributed by DrakeVagabond