After solving various cases extralegally to keep his town safe, Kouichi Haimawari has started to enjoy being a vigilante and has found new ways to utilize his seemingly useless Quirk. When his aspiring idol friend Pop☆Step receives an invitation to take part in an event in Osaka, he decides to join her. What the two are unaware of, however, is that a drug deal is going to take place at the venue. Unlike usual dubious businesses, the deal is run through legal channels, raising the case's difficulty.

Despite the danger, the event is allowed to proceed normally as the undercover police and a local hero are on the suspects' trail. Still, unexpected and dangerous things occur during the event, endangering the whole venue. As Kouichi steps in to keep Pop☆Step and civilians safe, he must remain ever vigilant as something even more nefarious seems to be unfolding in the shadows.

[Written by MAL Rewrite]