Marimo runs into Udonko, who is on her way to look for an unidentified flying object that crashed into a nearby park. While searching for the UFO, they meet up with Tomarin and Tanaka-san, who points them in the direction of some peculiar "playground equipment."
Riichi, ippatsu, tsumo, 
pinfu with a reverse dora!
Riichi, ippatsu, tsumo, 
pinfu com um dora reverso!