Roundabout, the Shortest Distance is Round

Haruto spends a lonely high school. The new teacher, Aoyama, cares about him and starts an exchange diary. Haruto gradually opens up, but one day, when he was resting because of a cold, he was kissed by Aoyama who came to visit him. Agitated by the sudden incident, Haruto violently refused and Aoyama was chased away from teaching. Three years later: Haruto, who graduated from high school and became a host, has debts and sells his body. But suddenly he meets Aoyama again.

There was a trailer...but it has since disappeared.