Please Help!!!

I'm a lover of manga especially if its romance but im looking for this story. Its new...
its about a girl and she is shy and has no friends what so ever. there is a guy in the same class and next to her that is popular but he doesn't want to be popular. once he looks at a girl they fall for him...sine the girl didn't fall for him he told her to be his gf for a month and then he will be his friend