Some information dump about this. I'm collecting information.
Source: ja.wikipedia.org/wiki/人身御供
In times of disaster, it was believed that nature, in its hunger, was unleashing its fury by demanding sacrifices. Therefore, before a large-scale disaster occurred, a suitable human sacrifice was offered to pray for its prevention.
Regarding Yamata no Orochi, the eight-headed serpent in the Kojiki , Masayuki Tsugita (1909-1983), a scholar of ancient Japanese literature , pointed out that the "wo" in "orochi" means "peak" and "chi" is a word that represents something supernatural, and that it is a water god in the form of a serpent with many heads and tails, and the spirit of the Hinokawa River (present-day Hii River) which flows through a confluence of large and small tributaries. Kushinadahime is written as Kushinadahime in the Kojiki. This name means the goddess of the miraculous rice fields, and the character for "comb" suggests that Hime was a miko (shrine maiden) who wore a comb. [ 17 ] [ Note 1 ] Takeo Matsumura believes that the eight victims in the myth of the slaying of the eight-headed serpent , including Kushinadahime, were spirit masters—that is, "human sacrifices of shrine maidens."
In his book "A History of Japanese Shrine Maidens," Taro Nakayama cites examples of shrine maidens and travelers who are thought to have been sacrificed as human offerings. [ 19 ] Nakamura states that the reason shrine maidens were sacrificed as human offerings is "it goes without saying that it was because they were in a sacred position that could appease the gods." He also mentions that there were Shinto rituals in various regions in which travelers were sacrificed as human offerings, and Nakayama cites the Naorai Festival of Owari Kokunomiya as an example.
Yatsuro has orochi vibes and has a maiden 'face'. Orochi ate seven daughters. Just a reference.
So perhaps it's not an Inari curse.