Takuroku Bocchi no Ore ga, Ano Tensai Bishoujo no Ghostwriter ni Naru nante.

"Onuma-kun, can I have just one of your songs?" With that question, the lonely Takuto Onuma starts a secret relationship with his classmate Amane Ichikawa, a beautiful and genius singer-songwriter who had become unable to sing. And so, counting on Amane's comeback, Takuto's days as her song composer begin... But what will become of the two?! Source: KADOKAWA