Sisters, or The Balance of Happiness（1979）

Sisters Maria and Anna live together. Maria is a most proficient executive secretary, encouraging Anna to finish her studies and start a career. Anna broods, threatens to quit university, takes pills, and keeps a diary. When Maria's relationship with Maurice, the son of her boss, starts to lead to love, Anna takes a selfish and drastic step that plummets Maria into solitude. No longer able to connect with Maurice, Maria does establish a relationship with Miriam, a typist at her office who becomes a surrogate younger sister. But Maria is intrusive as well as helpful. Can this or any relationship work out for this talented woman whose past seems to choke her soul?