Haruto is a freshman and a loner high school student until the arrival of the new teacher Aoyama. Aoyama cares for Haruto and starts to exchange letters with him, as something more grows inside both of them. But one night, an unexpected kiss ends their beautiful relationship. Three years later, Haruto has become a male prostitute in order to pay back his debts, when he reunites with Aoyama by chance.

Overcoming many obstacles, Haruto and Aoyama have finally become an item. They affirm their love for each other and agree to leave for faraway lands, but the following morning Aoyama disappears. Where could he have gone!? Before long, Shibahara, a man who claims to know all about Aoyama's situation, appears before Haruto. What secrets has Aoyama been hiding? Haruto returns to the male escort club and meets fellow castrated escort Ruka. In an industry full of temptations, will Haruto be caught up in the danger zone yet again? With the appearance of new characters, what impact do they hold for Haruto and Aoyama’s relationship?

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.