Just How Sporty Are You!? Everything is Fluctuating.
Yuko challenges Momo to a battle during the weekend, which ends up turning into an all-day running session. As Yuko ends up having to borrow money from Momo to take the train home, she ends up having to postpone their battle until she can pay her back so as to not spend her whole allowance. However, her friends end up coercing her into spending her money on udon. Meanwhile, another demon girl prepares to set Yuko back on the right path.