Kōfuku no genkai

幸福の限界

Also known as Kôfuku no genkai, The Limit of Happiness

The eldest daughter of the Takamatsu family, Atsuko, a widow, returns home due to not getting along with her late husband's family. On the other hand, the youngest daughter, Yukiko, is in love with a teacher older than her, much to her father's chagrin. All of this, together with Yukiko and Atusko not getting along, will shake the foundations of the Takamatsu family.