College student Tokiwa gets invited to a mixer by his female classmate Suo. But when he arrives with his friends, they’re greeted by three dazzlingly handsome men?! But as the two groups get to know each other, they find themselves getting closer in unexpected ways.

In this world, when a person reaches 12 years of age, their body begins to change depending on the gender they wish to become. By 14, they'll complete their transition. And yet I alone, without any gender, approach my 18th spring…

It was supposed to be a simple customer service call about a defective vibrator. But as soon as Yeong-Ha hears the husky voice of the customer service rep on the other line, he instantly falls in love. Soon enough, the man himself shows up in his everyday life! Not only that, but another operator with an equally incredible voice comes into the picture, along with a long-lost childhood friend. Surrounded by three gorgeous men, Yeong-Ha's love life is about to sound off!