Kareshi Kanojo no Jijou

Synopsis

Yukino tries to think of multiple strategies of confessing to Arima, but things don't work out as the way she planned. She later realizes though that it's her stubbornness that is causing the strategies to fail. She then tries to make Arima nervous so she can confess to him. She realizes she is scared to tell Arima how she feels because of her fear of getting hurt by him. In the end, Yukino finally gets the courage to confess. But instead of saying it to Arima, she ends up holding his hand in a meeting. By the end of the day, they are boyfriend and girlfriend.

(Source: Wikipedia)