Seventeen years ago, a baby boy was abandoned in front of the daycare center. In his small hand was an old die with a tiger sitting on the second dot. It was a mysterious ivory die made with prayers in ancient India. Now a high school student, Sho works at the "Niko Niko Garden" daycare center after school. One day, a small problem occurred at Niko Niko Garden. The mother of Shin-chan, a child attending kindergarten, hasn't come to pick him up. Apparently, his father has become addicted to gambling, and his mother is working hard to pay it off. The gambling is Chinchirorin, a dice game. When Choji hears about it from his granddaughter Minako, he worries, "That's not a game for decent people"