Basically, the uke was in love with the seme in high school and mistakenly caused the seme to be seriously injured (he had to retire from his club). The uke promised to do whatever the seme wanted and they got into a physical relationship. The uke didn't know that the seme was in love with him as well (the seme thought that they were dating). After graduation the uke disappeared and they met years later with the same misunderstandings.
Basically, the uke was in love with the seme in high school and mistakenly caused the seme to be seriously injured (he had to retire from his club). The uke promised to do whatever the seme wanted and they got into a physical relationship. The uke didn't know that the seme was in love with him as well (the seme thought that they were dating). After graduation the uke disappeared and they met years later with the same misunderstandings.