Ikebukuro, Tokyo. The strongest killers from Hakata arrive in the city of Ikebukuro where unique individuals gather!

Zenji Banba and his partner Xianming Lin come to visit Tokyo City to see a baseball game when an unfortunate predicament leaves them with none of their possessions and money. Needing to make quick money, they take the request to hunt down a bounty hunter. Along their adventure in the ward of Ikebukuro they encounter the local residents, from the normal average high schooler or rowdy bounty hunters to the city legends that are the mischievous informant from Shinjuku and a super-human man in a bartender uniform.