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What If the Strongest Final Boss of The Original Story Became The Protagonist's Companion?

Koutake Hiroyoshi, HanmenkyoushiAlso known as: Gensaku Saikyou no Last Boss ga Shujinkou no Nakama ni Nattara?;What If the Strongest Final Boss from the Original Story Became the Protagonist's Ally?;原作最強のラスボスが主人公の仲間になったら？;

What If the Strongest Final Boss of The Original Story Became The Protagonist's Companion? is a Manga/Manhwa/Manhua in english language, Action series, english chapters have been translated and you can read them here. You are reading chapters on the fastest updating comic site. The Summary is The original fantasy novel that was adapted into a game, "The Holy Hero Iris." One day, a man found himself reincarnated as the story's strongest final boss, the Empire's Third Prince, Ugram. To avoid his destiny of being killed by the protagonist, the enemy nation's Princess Iris, Ugram decides to seek asylum in her kingdom! And finally, he manages to meet Iris. However, the luxurious kingdom life✩ he was expecting does not begin... Between acting as Iris's swordsmanship instructor and bodyguard, going on dates, and becoming a father figure to a loli assassin, his everyday life is chaotic! He overwhelms his surroundings with his absolute defense, "Magic Barrier," which is powered by his innate "Magic Core," but...?! "Well, it is because I am the strongest." The lovey-dovey, cheat-filled life of a final boss who defected to an enemy nation and a pure, lovely protagonist (violent type?) is now beginning!