Steam gears roared overhead, spell runes falling like snow. Yu Kamiya, the "historical debris" collector at the bottom of District 7, was penetrated by a monster in the chest for the third time today. At the moment of death, he saw the remaining life span on his retina: three years. The next second, he woke up in a cold sweat and returned to the rental house three hours ago - still holding the blood-stained steam gear in his hand. This is his golden finger: death is the price of life. There was a knock on the door. Yukino Mahiru of the Spells Association, the rumored cold-blooded eldest lady, was using spells to explore his room. Last night, someone spread a rumor in District 7: "There are man-eating monsters in the sewers." This morning, the monster really showed up. Yukino Mahiru suspected Kamiya Yuu was the source of the rumors. Kamiya Yu knew that if he could not prove his innocence, he would be regarded as a sacrifice for "historical lies". He must use his death flashback to find out the real rumor monger before his lifespan runs out. And every time he returns, he will have an intersection with Yukino Mahiru - her loneliness under indifference, his self-destructive kindness, gradually entangled in the high pressure. When there was only one chance to turn back for the last time in his life, Kamiya Yu discovered that the truth that made him willing to die was not the source of the monster, but the flash of heartache in her eyes.
