The face on the last page is a face of someone who has steeled herself. Looks like in the next chapter, something unpleasant for readers will happen. It's just a hunch though.
@kronix I don't even get the point of this manga to be honest
The girl is in love with him, but still rejects him. Why? How could anyone believe for one second that he'd be dissatisfied with her, even after getting to know 'the real Nanoka' or whatever. In fact he already knows the "real her" because she's his best friend! If it's about her career and she's willing to put her career over her love, then she didn't really love him that much to begin with.
I've thought they could've made the crossdressing route big with something interesting but nah. Your biggest role of your life is pretty short, idol-chan. Quite meh.