Importance of Ueno

Soseki and Sensei are taking a walk in Ueno during flowering season when a very affectionate couple draws their attention. Soseki makes an amused comment about them causing Sensei to lecture him on love. Soseki mentions that he will never forget the conversation they experienced on that beautiful day. When they walk a distance from the crowd, Sensei wonders aloud if Soseki understood the guilt in love.