Koe ni Koi Shite, Koikogare!

Our protagonist is attending school with the goal of becoming an audio specialist. When his father is suddenly transferred, he finds himself in danger of not being able to attend school! It's a shame that his younger sister, Hinata, who aspires to be a voice actress, will also have to transfer schools. Is there any way they can earn enough to live on their own...? The three of them, including their childhood friend Akari, a singer, decide to sell audio content...! Will this erotic sales strategy that they are betting on be a success?