Yoakemae manga

Yoakemae summary:

From Shinnen: Recently, An's boyfriend, Kurosawa, has been acting strangely. Did he just cancel their date for Sunday? It turns out that he's helping his best friend, Kouta, who is in love with this other girl. But does he have to do this in spite of An's feelings!? Includes other short stories: Onaji Sora no Shita, Niji no Ame, Scratch Go-go