Yukito Kirihara, a 16-year-old, holds his 14-year-old sister Sana in high regard. Their lives take a turn when an ogre appears outside their window, seeking Sana. In an attempt to protect her, Yukito is killed. He is then offered reincarnation by a mysterious woman who presents him with a character sheet in a peculiar book. Upon discovering Sana's name also listed in the book, Yukito embarks on a quest to locate and rescue her, despite starting with only 1 hit point.
