This is another one-episode case, and it once again takes place during Kindaichi and Miyuki's junior high school days. The story is much heavier compared to the previous episode, but I think the ending was pretty good. There wasn't enough information for me to make a proper deduction, but my gut feeling about Mitsuyo turned out to be correct. The main issue I had was with the method used by the culprit. The solution sounds clever on paper but it becomes questionable when considering the actual mechanics of how pools work.