“If Noel kisses me, he can become an adult for a day.” Secretary Noel’s growth period had stopped with having a young boy’s appearance. Only Erina’s kiss can make him an adult. “I am a successor unable to speak to others. Unfortunately I’m not joking.” Erina is the only child of a head merchant, but her voice does not come out in front of people. Since childhood, only Noel could hear her voice. Getting in between them, another being appears, able to hear Erina’s voice. – I thought we were the only ones for each other. Unknown feelings rise within Noel’s heart. However, Erina is an impossible match for Noel as he’s a secretary of unknown origin. Erina is on a journey to become the head merchant. At the end of this journey, can the two be the only ones for each other again?