The Shortest Distance is Round Collection

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.

Haruto and Aoyama, once a couple, are now completely without contact. As Aoyama's secrets are gradually revealed, Haruto, now the shop manager of an underground escort club, is starting to question whether the man he loves is worth the wait; his feelings for escort Ruka has also evolved from mere compassion into something more. A mystery sex toy links the past and now of Aoyama, Shibahara, Ruka, and Haruto. A sudden murder then happens in 'Rain& Soda' as one of the escorts serves a customer. The murder horrifies the club, and the truth is soon to be brought under the light of this sensual world of sultriness.