While the entire series "HIStory" is based on trope BL situations, this story itself was one I didn't favor. While the trope was easy to guess right away I would also give props for the notebook aspect. The story lost a lot of points, for me, because there was rarely any scenes of the two men spending quality time falling in love (outside flashbacks). Most of the entire series was about the girlfriend. So while there is an element of BL it wasn't entire a focus, I think, in this series.