
I don’t understand

Its a prequel to the series hana no mizo shiru. It tells about the story of the professor and the MC's grandfather.
It takes place in ancient japan (i dunno which era TT) where the blond hair fell in love with his childhood friend, the black hair guy, so he confessed but got rejected and their friendship also started drifting apart. Later it is known that the black hair guy also like the blonde guy but the black hair guy already have a fiancé decided by his family because the fiancé family help the black hair guy's family before ( ancient asian culture ) thus why the black hair guy unable to reprocriate the blonde hair feeling.
The point is they love each other but unable to be together.
THE ART STYLE OMG