Tsumi no Kyojin to Gindokei no Aria

is a Japanese light novel series written by Minato Ishikawa, with illustrations by Kashii. The series began publication on October 10, 2018 by ASCII Media Works under their Dengeki Bunko publishing imprint.

Synopsis
The legendary giant "Shin", also known as a natural disaster. The hero who aims at the magic stone "Giant of Time" that is in the heart is taken into the body of the giant from a momentary ski.

The awakened hero lost his memory and was no longer protected by the spirits. What appeared there was Aia, a girl with a silver clock, whose stakes pierced her chest and she didn't even know when she was here. The two head to the heart of the giant to find the hero's memory and exit.

As the hero opens the door to the next room while advancing through the dungeon full of traps, suddenly someone pushes his back and falls head-on into the abyss.

"I'm sorry, but that's it. Goodbye, brave man--"