Yuko is tasked with defeating the maidens of the Tribe of Light (i.e. magical girls) by her ancestor, Lilith, so Yuko challenges magical girl Momo Chiyoda to a fight.
However, Yuko is not a very strong demon girl, so Momo is easily defeats her.
Additionally, Minami Takahashi provides the voice of Lilith, while Tomoyo Takanagi provides the voice of Mikan Hinatsuki.