[Machine Translation] Tomorrow is the start of a fun and exciting summer vacation! However, just when she wants to make love with Sada-kun, Sada-kun's sister suddenly appears! Erika is just as intimidated by her sister, who is just as strong a character as Sada-kun.... And for some unknown reason, she and Sada's sister and brother are going to Kobe, where Sada's parents live! Erika is happy to be able to spend time under one roof, but her nerves are at their maximum when she meets her mother for the first time! The first extra chapter is also included in the book, making it a perfect read!