@Animelie Because Ichi was taking photos for Yamada, she thinks she has to atone for being the reason Ichi's arm is fractured. Essentially, she's just feeling really guilty for both not being able to help Ichi and for being useless at helping him.
@Animelie Ichi was hiding the fact that he fell when he was taking a picture she asked him to get, so she sees his injury as directly her fault cause otherwise he'd not of gone out to get a snow picture.
Every romance needs drama to progress, and there's nothing wrong with that, but the subtle way it's presented here is what makes it great and sets it apart from the rest.