Blue Gate Crossing

Kerou is a sullen teenager who tries to act as a go-between when her shy friend Yuezhen falls in love with Zhang. Kerou approaches Zhang on her friend's behalf, but the boy likes Kerou instead and doesn't want to hear about Yue Zhen. As Zhang is the popular kid at school - a swimmer with an easy way about him - Kerou thinks she should be happy, but she's not. She is beginning to realize she has feelings for her friend Yue Zhen.
(Source: Asianmediawiki)