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Strange beings known as "Tsugai"

These are paired entities based on myths, yokai, folklore, and UMAs that are contracted and commanded by humans. As a basic rule, Tsugai are beings that protect and obey humans, but some are reincarnations of the dead or possess god-like power, engaging in battles with various abilities.

Fate's Twins and "Break" & "Bind." The core of the story revolves around male and female twins born at sunrise on a day when day and night are equal. By dying once, the twins can obtain the power of the Tsugai of the Underworld: "Break," which forcibly unravels anything in the world, and "Bind," which forcibly closes anything. The protagonist Yuru possesses "Bind," while his younger sister Asa possesses "Break."

The boundary between life and death

The worldview is rooted in concepts of life and death such as "Yomotsu Hirasaka" (the slope to the underworld) and "Resurrection." It depicts the cycle of life with Tsugai and the succession of life predicated on death.