Man, I like the fantasy aspect of Daichi liking an idol who likes him in secret, but he should just say yes to Mao at this point. They are a good fit for each other. Besides, I think he'd make for a better friend than boyfriend for Nanoka. They can have a nerdy otaku friendship and I think she would be better off for it, because it would give her a chance to be "uncool" and not worry about impressing him as a girlfriend.