Also, since titles can be misremembered or mistyped, I should consider possible typos. For example, "kyūin" might be "kyūjin" (巨人) meaning giant, but that doesn't fit. Alternatively, "kyūshoku" (旧作) meaning old work. Maybe "kyūsō" (旧装) related to dress. But the most plausible is "kyū" (old) + a noun. Given the context, "old life" makes sense. So the story could be about a character reliving a past life or experiencing an old life in some other way.