What is "tenchu"

Tenchu (天誅) is an action-adventure stealth video game series, originally developed by Acquire, where the player assumes the role of a ninja. The title in Japanese literally translates in English as: "Divine Retribution", with 天 (ten), meaning heaven and 誅 (chu), meaning death penalty (another translation of this phrase, Wrath of Heaven is the title of the first PlayStation 2 entry in the series).