Well, she's an adult and doesn't want to indulge in her habits. She's been against it from the start, but keeps giving in. It's not something she's proud of. She's made comments suggesting that, along with some of her behaviour.Still wondering how the don’t end up together in the end. Though I suppose considering the endings of the other stuff the Author has put out it could be worse.
Do you have any plans on translating Okada sensei's New manga after finishing this one? It appears to be related to pansuto.