Jus2's song "Long Black" (Japanese Version) is about the addiction and obsession towards one's significant other, comparing it to the addiction to coffee or caffeine. The lyrics express the longing for the other person's presence, as they provide strength and comfort in the midst of exhaustion and tiredness. The song also highlights the uniqueness and exclusivity of the bond between the two individuals, as they are each other's "one and only". The title "Long Black" refers to a type of coffee beverage that is strong and deeply satisfying, just like the love and connection shared between the two people in the song. Overall, the song is a romantic and passionate ode to the power of love and companionship.
