What if the Strongest Final Boss in the Original Becomes a Companion of the Main Character?

What If the Strongest Final Boss from the Original Story Became the Protagonist's Ally?

What if the Strongest Final Boss in the Original Becomes a Companion of the Main Character?
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What if the Strongest Final Boss in the Original Becomes a Companion of the Main Character?

What If the Strongest Final Boss from the Original Story Became the Protagonist's Ally?

Gensaku Saikyou no Last Boss ga Shujinkou no Nakama ni Nattara? • What If the Strongest Final Boss of The Original Story Became The Protagonist's Companion? • 原作最強のラスボスが主人公の仲間になったら?

Origination: Manga
Demographic: Seinen
Published: 2025
Status: 📖 Ongoing
Translation: 📖 Ongoing
Ranked: #10,870
Followed by 1,052 users
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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!

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Authors: Hanmen Kyoushi
Artists: Koutake Hiroyoshi
Genres: Adventure, Fantasy, Isekai
Theme: Reincarnation
Format: Adaptation
Publishers: Shueisha

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Most Helpful Reviews

Zitronenpresser avatar

Zitronenpresser

6 reviews569 follows

Posted 9:15 AM · Oct 4, 2026

Recommended
7/10
Reviewed through Ch. 13 · 100%

Overall ok

The romance part of this probably has the highest potential for me to be good. The art is also decent, fight scenes are pretty average and very short. Spoilers/rant This is also a story that would have benefited by not being an Isekai. The only motivation the mc has to defect to fml country is that he doesn’t want to die basically and changing his own country is impossible. This would have been a way better setting if he had grown up and discover that his country treats their subjects terrible and exploitation,...

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