Nyatto! Chapter 14-Summer Festival
One other thing to mention is "Kaiawase" or "Matching Shells" which is a matching game played with seashells and was a popular game during the Heian period... Ironically (or not so ironically) enough, "Kaiawase" is also a homophone for a sexual act... I'll leave it to you to find out, ENJOY!
Chapter 14- Summer Festival