Malty S. Melromarc, eldest princess of the Melromarc Kingdom, first appears under the alias "Myne Sophia." She masks herself in superficial charm and kindness, leveraging her royal status and beauty to manipulate others. Her core nature reveals extreme selfishness, pathological lying, and an absolute absence of empathy or remorse. Sadistic tendencies emerged early, with her deriving pleasure from inflicting suffering. Her parents sent her abroad for education to curb these traits, but the effort accelerated her moral decay. When the Cardinal Heroes are summoned, she volunteers to join the Shield Hero, Naofumi Iwatani, feigning support. She swiftly steals his possessions and falsely accuses him of rape, causing his persecution and ostracism. This betrayal stems from her desire for amusement and prejudice against the Shield Hero, revered by demihumans. She then manipulates the Spear Hero, Motoyasu Kitamura, exploiting his gullibility by joining his party. Later, she betrays the Sword Hero, Ren Amaki, and Bow Hero, Itsuki Kawasumi, robbing them and coercing them into illegal activities for her profit. Exposed during a public trial, Queen Mirellia strips her of royal status and privileges. Her legal name is changed to "Bitch," and her adventurer alias becomes "Whore." Queen Mirellia later designates her "Witch" to mark her as a wanted criminal. Unrepentant, she escalates her villainy, seeking revenge against Naofumi and her family. She allies with the interdimensional terrorist group, the Waves Vanguard, using their resources to travel across worlds and perpetuate destruction. Her actions indirectly ignite pivotal events: - She triggers the Cardinal Heroes' curse series. Naofumi gains the Wrath Shield from her betrayal; Motoyasu unlocks the Lust Spear after her abandonment; Ren attains the Greed and Gluttony Swords following her theft; Itsuki obtains the Pride Bow through her manipulation. - She orchestrates Queen Mirellia's assassination by urging Takt, leader of the Waves Vanguard, to kill her. This severs her final family ties, leading her father to disown her and endorse her execution. In her final scheme, she attempts to merge worlds to reclaim power but faces defeat. Her incorrigible nature endures until death; she never expresses genuine remorse or accepts responsibility for her actions.