Man, talking about 'Kabukichou Bad Trip' brings back memories. I remember picking it up after finishing 'Tokyo Revengers' because I was craving more delinquent-themed stuff set in that gritty Shibuya/Shinjuku vibe. The main duo is definitely Kuga and Ruka – Kuga's this hot-headed, impulsive guy who gets dragged into the underworld after a night out goes horribly wrong, and Ruka's his more cautious friend trying to keep them both alive. There's also this terrifying crime boss named Jinguuji who controls a lot of the shady business in Kabukicho, and a hostess named An who gets tangled up in their mess. The dynamic between Kuga's reckless bravery and Ruka's desperate attempts to apply logic to a completely insane situation is what really drove the story for me.
Honestly, I found Kuga kind of frustrating at first – he makes so many dumb decisions – but you grow to understand his twisted sense of loyalty. Ruka is the audience's anchor, the guy reacting the way any normal person would when thrust into a yakuza nightmare. The side characters, like various club owners and enforcers, all have this exaggerated, almost grotesque quality that fits the 'bad trip' title perfectly. It's less about deep backstories and more about surviving the next five minutes in a neon-lit hellscape.