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666 Satan (666~サタン~, Roku Roku Roku Satan), also know in US as O-Parts Hunter, is a Japanese manga series published by Square Enixhttps://opartshunter.fandom.com/wiki/Manga_Guide

Rat (zodiac)
The Rat (子) is the first of the 12-year cycle of animals which appear in the Chinese zodiac related to the Chinese calendar. The Year of the Rat is associated with the Earthly Branch symbol 子.