Legendary Girlfriend: "Making a wish on the medallion"

While Ginta is pestering Miki to tell him how she feels they get interrupted by none other than, Yuu. Miki runs in the house and Ginta learns about how Miki and Yuu really know each other. Later the next day Miki tells Ginta that she's really confused right now, and until she sorts out how she feels they should continue being friends. After school that day Meiko and Miki find out where Yuu works and they meet his boss. He tells them his amazingly beautiful story about him and his current wife but doesn't tell them that it's him. The next day Ginta is practicing and find out that his partner for the tournament has broken something and has to take it easy. Yuu is asked by Miki to be Ginta's partner and he accepts it. Yuu agrees and runs to the library and he sees something happen between Shinichi and Meiko. What did he see?