She was an idol only for me and her girlfriend

My girlfriend, the vowel rumor is a little conspicuous in her class, but actually there is another face. What is concealed is the center 'shuno urara' of national idol group sakasaka 69. However, there is a school rule prohibition of the school activity in our school, and the idol is an idol. It is the secret of the curse that only me who is the boyfriend knows. By the way, we promise that each other is neither a virgin nor a virgin until it becomes an adult.