The Bounce-bounce Girl - S1.E8

After being tricked by Kokoro with more false hopes of retrieving their Toys, Milky Holmes end up catching colds. Henriette spends the night nursing them back to help and ends up catching a cold herself. Milky Holmes decide to help nurse her back to health, and upon changing her clothes find her Arséne disguise, though they quickly pass it off as cosplay. Sherlock gives Henriette a rather dubious medicine that causes her Toys to go berserk, trapping everyone within a strange Momotaro-inspired illusion.