Spring break is over, and in the chilly season, the interesting stories of the three sisters of the Nan family continue to unfold. The eldest sister Haruka (voiced by Sato Rina) who exudes the radiance of the Virgin Mary continues to take care of the family's daily life, of course, she will be lazy from time to time; the biggest laugher Shana (voiced by Inoue Marina) is making great strides in being silly and cute, and makes a lot of jokes with Fujioka (voiced by Kakihara Tetsuya), Riko (voiced by Gaoliang Aoi) and her sisters; Chiaki (voiced by Chihara Minori), who seems to be indifferent to everything around her but actually observes everyone calmly, is becoming more and more skilled in her spitting skills, either saying nothing or saying something shocking. From the refreshing spring to the hot summer, the vigorous, youthful and cute ladies are here as promised... This film is adapted from the manga of the same name by Sakuraba Koharu, and is the fourth season of the animation series.