After taking 2012 off, hotsprings resort anime Hanasaku Iroha returns in March with Masahiro Ando back at P.A. Works to direct a new Mari Okada script. Now, a new listing has revealed the plot premise for the follow-up movie Home Sweet Home.
From @ultimatemegax's translation:
Ohana has grown accustomed to living in the hot springs inn her grandmother manages, Kissuisou. One day, the daughter of a manager for Kissuisou's rival inn, Yuina, comes to Kissuisou for training to become a landlady herself. As Ohana is observing her training, she finds "a certain item" in the storeroom while cleaning.