Yamada's relationship with Ichikawa is rather shallow, she only liked him cause she resembles her favorite manga protagonist and her daddy, I wouldn't be surprised if the Pickup guy steal her in the end.
@conicalPendulum420 I wouldn't say that. She has noted Ichikawa's kindness and personality. She even kept a milk bottle as a keepsake due to one such act of kindness. His facial features definitely leave a better impression on her mind, but she wants to be with him for his character. His looks got him through the door, but it was his personality that did the rest