Pairing: Haru x Rin

Based on an ongoing novel by Kakine Ryosuke, first in the series.

Every human is going to ruin, a deadly battle with a drug and without a winner.

A heroine summoned to another world as a bonus for being a "saint"—what awaited her was a forced marriage to a bird-man with deadly poison...!? Kanzaki Rui was summoned to another world along with her twin sister. While her sister, who has an aptitude for all kinds of magic, is treated as a "saint," Rui, who has no aptitude for magic and only possesses "poison resistance," is treated terribly. One day, Rui is forced to marry the emperor of a neighboring country overrun with beastmen, as a substitute for her sister. The emperor himself is descended from a demonic bird that harbors deadly poison, and is known as the "Emperor of Poisonous Venom," possessing deadly poison all over his body. A "political marriage" between a lonely king and a substitute saint. The destinies of these two, who should never have intersected, begin to move little by little. (Source: Echo, translated)

The victim's "proof of life" is always found at the scene. Kuzuhara Akane is a new forensic investigator assigned to the Criminal Investigation Division. As Akane strives to become a full-fledged forensic investigator, she meets Sugurishiro, a man with 12 years of experience in the same forensic investigation division who has an unrivaled fetish for bones. At the first crime scene she goes to with Suguris, they come face to face with a drowned body that has been pulled from the sea. Akane's legs freeze when she sees the Severely damaged body. However, the identity of the body that Suguris discerns is a surprising person...? Drowning, suicide, murder, lonely death. A shocking detective forensic mystery in which the truth is revealed by the last voice of the unnatural death ! Based on the story/"The Prayer of the Forensic Investigation Division: The Case Files of the Osaka Prefectural Police's "Unnatural Deaths" (Murakami Kazuo, Wakaba Bunko) Supervised by Murakami Kazuo (former Osaka Prefectural Police Inspector)