My girlfriend "Kokoro-chan," who goes to the same university as me, has always dreamed of becoming an idol, and in addition to her studies, she belongs to a group called "Somato-zaka 69" and is doing her best in what is called "entertainment activities," such as shooting music videos and holding handshake meetings.... As her boyfriend, I was cheering her on as she worked hard. One day, I happened to replay a video clip of "Cosplay Girlfriend's New PV," and I was watching it with a huff and a puff...!