Himitsu no Virgin Road

First volume of Tami Takada's age gap romance stories, Otona no Inryoku:

1. Himitsu no Virgin Road (ひみつのバージンロード)
   
   Tomoe wants to meet her boyfriend who goes to a university in Tokyo. She came to Tokyo because she took a summer course at a prep school for a week. However, she felt a distance from him who became an adult. The last day is Tomoe's birthday.
   
   
2. Tenshi no Yuuwaku (天使の誘惑)
   
3. Ikutsumo no no Hoshi no Shita de (いくつもの星の下で)