Itsuki Kawasumi/Chronology

Volume 1
Itsuki is the Bow Hero one of the Four Legendary Heroes summoned from another world. He was summoned along with the three other Legendary Heroes in Melromarc. Like two of the other heroes, Itsuki pretends that he doesn't particularly care about being summoned and believes that he is in a much higher league than the rest of the heroes.

Because of his strong sense of justice, Itsuki believed that Naofumi was nothing more than guilty when Naofumi was accused by Myne. Like the other heroes, he used this opportunity to make himself look better in front of everyone.

Though when Naofumi lost the duel against Motoyasu, Ren and Itsuki were the ones to call out Myne for her illegal interference in the duel and announced that Motoyasu was the loser.

Volume 2
He vanquishes those he sees as evildoers without thinking of the consequences of his actions. He and his companion always travel in secret and defeat those he believed to be evil doers. There are times when the castle requested him to deal with the corrupt nobles, one such incidence is the Northern Territory.

Volume 3
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Volume 4
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Volume 5
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Volume 6
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Volume 7
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Volume 8
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Volume 9
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Volume 10
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Volume 11
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Volume 12
Itsuki was found in Zeltbur Coliseums for money to aid Mald and Malty for their so-called justice. Naofumi, Ren, and Rishia tried to reason with him but failed to lead to a death match between Itsuki and Rishia where the latter emerged victoriously. Under the influence of the Curse Series, Itsuki wishes to make everyone in the world understand him and believe his version of justice, via brainwashing arrows, he goes completely off-kilter, trying to outright kill Rishia when she said his stance on justice was utterly mistaken, ignoring what she said and saying that everyone and everything that goes against his beliefs to be evil.