De La Jet Set Radio cutscene 5 (Route B) Poison Jam's frogs

Jet Set Radio (originally released in North America as Jet Grind Radio) is a 2000 action game developed by Smilebit and published by Sega for the Dreamcast. The player controls a member of a youth gang, the GGs, as they use inline skates to traverse Tokyo, spraying graffiti, challenging rival gangs, and evading authorities.

Sega re-released the game in Japan under the name De La Jet Set Radio. This version was released on October 18, 2001, in Japan via Dreamcast Direct (later renamed Sega Direct) and features content that was originally exclusive to PAL and North American versions, namely music, two playable characters, and two stages.

Completing Monster of Kogane after the frogs invaded GG's garage will reveal that it was Poison Jam who sent these swarm of frogs to the garage as prank but after the GG start taking over Kogane-cho one area after another, the Poison Jam were pissed and they're challenging the GG as revenge for taking their territory. As DJ Professor K said it, a vampire is on the prowl and that's Poison Jam!