Oobi is at home, anxiously waiting for his first piano lesson. He is playing random notes on the piano and counting them. The doorbell rings and Grampu answers it. He sees Oobi's piano teacher and is immediately attracted to her. She introduces herself as Inka and compliments Grampu's house. Oobi is both excited and nervous. Grampu offers Inka a drink, and she asks for some tea.
As Grampu makes a cup of tea, Inka tells Oobi that he has to stretch out his fingers before playing the piano. He does some stretches as Inka plays a major scale. She asks Oobi to do the same, but he can't. She explains that relaxation is key when you're playing a musical instrument. Inka plays the scale again, this time singing along with it. Grampu is an awe after hearing Inka’s singing voice. Oobi tries to play a scale again, but he still can't. Inka tells Oobi to take a deep breath and try again. Next, Grampu tells Inka that her tea is ready. She tells Oobi to practice.
While she and Grampu drink their tea, Inka asks Grampu if he plays the piano. Grampu tells her that he can play, but not well. Inka looks at his fingers and says that he has the fingers of a musician. Grampu is flattered, but he shrugs it off. Oobi asks Inka if she can show him the scale again. Inka asks Grampu to show him instead. Grampu nervously agrees and plays the scale perfectly. After stretching, Oobi starts playing the piano. He's astonished at his skills.
Oobi, Grampu, and Inka decide to play the scale on different octaves. Inka sings along as Oobi and Grampu play together. Afterwards, Oobi thanks Inka. She mentions that she likes Oobi and looks forward to his next piano lesson. Grampu, obviously in love with her, screams out "Grampu like Inka!" and quickly says that he appreciates her efforts. Inka tells Grampu that she likes him, too. Grampu blushes, and they look into each other's eyes, showing that they both have feelings for each other.
After Inka leaves, Grampu leans against the door and daydreams about Inka until Oobi snaps him out of it. In an interview segment, Kako asks the viewers if they've ever taken lessons. Later, Oobi and Grampu play a stop/go game. Grampu plays the piano and Oobi dances. When the music stops, Oobi stops. Uma pops up and asks if she can play the piano. She starts hitting random notes on the piano with her palm. Oobi and Grampu both agree that Uma should take piano lessons as the episode ends.