The story centers on a remote, isolated island called Koumi Island. The island has a unique and bizarre custom that is essential to its survival. Due to a curse or a special characteristic of the island's women, they are able to conceive children only on a specific day—the 7th day of a certain cycle (often interpreted as a week or a specific time of the month).
Because of this limitation, the island faces a crisis: the birth rate is dropping, and the population is dwindling. To ensure the survival of the islanders, the village elders and the women actively seek out men to impregnate them during this fertile window. koumi-jima shuu 7 de umeru mesu-tachi
The episode’s subtitle, “Shū 7 de Umeru Mesu‑tachi,” explicitly foregrounds gender (“mesu” = “girls”). Unlike earlier episodes where male characters also fall, the concentration of female deaths here foregrounds the gendered nature of the curse. Scholars such as Yuko Kinoshita argue that this reflects a cultural anxiety about the erasure of female agency in contemporary Japan, where women continue to confront structural barriers in education and employment. The story centers on a remote, isolated island
Following the triple tragedy, the series shifts tone. The surviving male protagonists, plagued by guilt, begin to re‑examine the island’s history, uncovering a buried diary belonging to a female villager who was historically blamed for the curse. This narrative pivot suggests a redemptive arc, wherein the recognition of the girls’ stories becomes the key to dismantling the supernatural cycle—mirroring real‑world calls for historical reckoning with gendered oppression. Each girl’s death follows a symbolic logic tied
Each girl’s death follows a symbolic logic tied to her archetype:
These deaths echo the Japanese concept of on (obligation) and giri (duty), suggesting that the girls’ adherence to socially prescribed roles ultimately leads to their undoing.