The miniature yet equally troublesome versions of Ikebukuro's residents run amok. However, instead of engaging in deadly schemes, everyone is gathering to organize a laid-back summer festival! Ikebukuro's strongest man is running a chocolate banana stand, the feared Black Rider dresses in a cute yukata, and even the infamous information broker is unknowingly helping everything go smoothly. It seems that as they shrank, so did their problems, and the busy world of gangs and the supernatural finally gets a well-deserved break. [Written by MAL Rewrite]