Cold But Kindhearted Best Friend

What does it feels like when you're feeling this thing called love? Probably useless for a person like Oshima Yuko, she's the type of girl who used to be cheerful. But something happened, she was mesmerized by her best friend, Kojima Haruna, who happens to love another person, not Yuko. Yuko will always tell herself to be happy because Haruna is happy, she's willing to do anything whatever it takes, just to make her dear best friend to be happy. When will Haruna realize Yuko's true feelings for her? Its been a while since the two of them were together, busy with school, hanging out with others, how will Yuko express her love for Haruna? Will she remain the old happy Yuko or will she be the new Yuko who's cold but kindhearted of Kojima Haruna?