If you put some candles on this it could be a birthday cake! If you don't have a cake pan, just use a round plastic tupperware container. Just decorate with your favorite things.
I wanted to make something that could substitute for a birthday cake.
Press down very firmly in Step 4, or the 'cake' may fall apart when you flip it over. When you flip it over, if it won't come out easily just tug on the plastic wrap a bit and it should come out.
Enjoy Japanese food around the world.