I wonder where things are going to go wrong. Now that I thing about it this relationship was always on thin ice. She's already starting to see inconsistencies within reality.
With his manga being serialized he's going to be a lot more busy with work. Will he get an assistant?
How is he going to even explain him leaving for work this often to Mayuko. I just can't see him juggling his manga and hiding his identity from Mayuko.
In fact what is his long-term plan here? I don't mean to act like his father and brother but it really does seem he doesn't have enough talent to be a mangaka or at the very least to be making a sustainable income from it.
Also what's his plan with Mayuko? His situation with her is going to blow up in his face if he doesn't seriously think of a way to deal with her.