Apartment 1303

Mariko, Sayaka's older sister, is determined to uncover the truth behind her sibling's sudden and tragic death. After losing Sayaka unexpectedly in a shocking suicide on the thirteenth floor, Mariko embarks on an emotional investigation that not only delves into the events leading up to that fateful night but also seeks answers about the underlying factors contributing to Sayaka's despair. As Mariko navigates through her sister's personal life and uncovers dark secrets buried within their own family history, she grapples with the overwhelming grief of losing a loved one in such heart-wrenching circumstances. Through her quest for justice and understanding, Mariko must confront painful truths about her relationship with Sayaka and the chilling reality of mental health struggles faced by those close to us.