The characters of Durarara!! have been shrunk down into chibi versions of themselves, and these miniature residents of Ikebukuro are running amok through the city streets where reality and illusion constantly blur together. The supernatural brawlers, gang members, and information brokers who normally engage in deadly schemes have set aside their violent conflicts to organize a laid-back summer festival. Ikebukuro's strongest man, Shizuo Heiwajima, trades his usual rampages for running a chocolate banana stand. The feared Black Rider, Celty Sturluson, sets aside her Dullahan duties and dresses in a cute yukata. Even Izaya Orihara, the city's infamous information broker, finds himself unknowingly helping the festival preparations run smoothly. As the characters have grown smaller in size, their problems have also shrunk, giving the normally chaotic underworld of gangs, headless riders, and superhuman brawlers a well-deserved break. The story unfolds as a series of comedic, gag-driven vignettes that follow the daily antics of these tiny versions of familiar faces, exploring lighter adventures and playful interactions that never appeared in the original narrative. Running from chapter to chapter, the manga collects both characters from the first and second seasons of the parent series, weaving together plots that feel like bonus material and extras that fans never got to see.