妖怪ウォッチ♪ ジバニャンVSコマさん もんげー大決戦だニャン

One day, a mysterious event suddenly occurred. For some reason, Jibanyan's favorite sweet: Chocobars, and Komasan's favorite: soft-serve ice cream, began to disappear from this world one after another. Why? A mysterious Yo-kai appears and tells them, "The way to bring Chocobars and soft-serve ice cream back to this world is for Jibanyan and Komasan to fight." Meanwhile, Hovernyan and Komasan's sister, Komami, who is a spy, discover that there is a Yo-kai behind this incident. There was a great conspiracy hidden. In addition, the unprecedented crisis surrounding Lord Emma, the strongest being in the Yo-kai World, is revealed! Where is Jibanyan VS Komasan? And who is the mastermind behind the incident?

(Source: Yo-kai Watch Wiki)