Resound, My Voice! To What It Used to Be!!

Amu's family receives a wedding invitation from Amu's cousin, Shuu. They go to the hotel where Shuu works and Amu finds him in the kitchen. Shuu's dream is to be a patissier and he is excited about his wedding and making his first wedding cake. When Shuu's fiancée, Eriko, arrives, Shuu sticks his foot in his mouth and earns a slap from Eriko.

Synopsis excerpt via Kitsu.