Soul Eater, Vol. 5

On the night of DWMA's anniversary celebration, every meister and weapon
in Death City has gathered at the school for an evening of music and
dancing. Little do they know that the witch Medusa is about the crash
Shinigama-sama's party. Trapping the meisters inside, the witch makes
her way to the chamber where the First Kishin is imprisoned. Will the
few meisters who've managed to escape be enough to prevent Medusa from
rousing the madness that slumbers far below in the Kishin's domain?