The Water Palace of 5 Colors (1) Meitantei Conan : Season 1 Episode 210

Kogoro, Ran, and Conan came as the substitutes for Serena and her father, the Suzuki president, and decided to attend a tea meeting at the Aonogi house. At the backyard of the mansion, there was a pond that shined in five colors. And there was a bridge which led to the tea room. While they were enjoying the pond’s colors something unusual happened… The headmaster died in the tea room, the same way as the legend.