Haruno Yukinoshita : The Woman Behind a Thousand Smiles

When Haruno has a passing suspicion that her younger sister might like a guy in her school, she decides to know more about him. Who is Hikigaya Hachiman? Is he interesting or just plain boring? No, she is not personally interested in him. She is doing this for the sake of her younger sister. So what if she comes to like him a little. It's not a big deal. She is perfect. And he is?