the ending comes directly after the High School arc, that's supposed to be chapter 60 here. Yuu and Yuuto are unable to find a way to turn back and decided to live on their lives with each other's body. Yuu (in Yuuto's body) tried going out with glasses, but was depressed because they could never truly love each other, couldn't go through the hardships of a man's body and committed suicide. Yuuto (in Yuu's body), now presumably married to and had a child with Tachibana (the delinquent guy), heard the story from glasses, regretted not having spotted her ( Yuu's) depression sooner and not being able to help her, before collapsing and crying next to his son.