【Trailer House × Maiden × Lost Journey Story!】 Traveling around the world, Vihita, Aban, and Yuta are a family-like trio living in a giant trailer house called ≪Sauna≫. They buy ingredients, dress up, and although they have no spare time, they are living cheerfully today as well. One day, in a certain town, a lost little girl sneaks into the sauna, causing a big commotion!? Three maidens of different ages and backgrounds set out to return the lost child to her hometown! A heartwarming trailer story begins!