Mei-chan no Shitsuji Episode 4

Rihito headed to a certain place without witnessing the duel between Mei and Izumi. Shinobu, who appears in front of such a man, says that he can no longer serve Mei. Shinobu has already taken steps to help Mei lose in this duel. Still, he believed in Mei's victory and didn't doubt it. Around the same time, the duel between Mei and Izumi was about to begin at the Saint Lucia Girls' Academy. This duel is a treasure hunt. It was to find a treasure chest hidden somewhere in the school. The treasure chest is said to contain what Izumi's butler Kiba holds dear. (Source: TVDb)