After elementary schooler Keita Amano (Nate Adams) frees a Yo-kai butler named Whisper, he is granted a special watch that allows him to see the Yo-kai causing trouble all around him.
It is the year 2030, and the stage is the capital of Japan, Chou-Tokyo. Through "Buddyfight", humans have started cultural interactions with residents from other worlds called "Affinity Dimensions". Buddyfight is a game with selected humans as the "Buddyfighter", and residents from the other world as the partner (known as "Buddy Monster"). These battles have high significance and sometimes it is even used to decide the fate of a nation, and naturally there are those who seek to use the Buddy Monsters for evil purposes.
A small town inhabited by a number of people and children. Each episode represents something from their daily lives, featuring wonderful themes and songs that present information in an enjoyable way.
Momo (Rika Adachi) hopes to become a video game designer. She has applied for numerous jobs in that field, but has failed every time. Finally, Momo is hired as an apprentice to a game programmer. While accumulating experience, Momo, with her strong will and love for games, grows up.