Rishia Ivyred/Chronology

Volume 4
Rishia was present in the story from the time of the third wave, she wasn't that visible as a character.

Volume 5
During the Cal Mira Island Arc, she saves the heroes in a losing battle against the people from the other world using a dud barrel bomb filled with Lucor fruit, dizzying all other entities with the exception of Naofumi.

Volume 6
After the event, the Queen praises and acknowledges her efforts, but Itsuki, bitter about his easy loss at the hands of the enemy, is angered that his subordinate is getting more recognition than he is. This pettiness is later revealed to be Itsuki's true reason for kicking her out of his party, as he knew that she was merely being framed by his fellow party members. Itsuki falsely accuses Rishia of breaking Itsuki's bracelet that he got from Sweed which deeply upsets her. Everyone in the party including Itsuki shuns her out of the party. She responds by trying to commit suicide only to have Filo save her. Naofumi demands an explanation of Itsuki, only to be told that he was caring for her, since she was not suited for fighting.

Running into the sea in hopes of dying, Rishia's suicide attempt is foiled by Filo and Naofumi, wherein the latter convinces her to keep living after seeing himself in her. Naofumi is outraged that she is being falsely accused and asks her to join his party in order to become stronger. She hesitantly does so for Itsuki's sake. She is level 68 when she joins the party so in order to compensate for her lower level, she is asked to wear the Penguin Plush. Despite everything, Rishia remains devoted to the Bow Hero and hopes to someday return to his side.

Naofumi asks her to consider becoming his because he has an ability that boosts the growth of his slaves called Slave Growth Correction ability. He also learned of a way to reset her level/stats/class up a choice from the queen which he also offered to do for her. After considering it heavily, she decides to trust him and become a slave. Soon after accepting, a High-class slave crest was engraved on Rishia’s chest. Just like with Bitch, after a while it became invisible.

Volume 7
She joined hands with Naofumi in the fight against the Spirit tortoise and showed her hidden skill during her fight with Kyo. She crossed over into the other world because of her belief in her own version of justice and continued her fight for it. She even amazed Naofumi by learning the other world's language and writings. She antagonized Kyo for reason of Ost & Itsuki and fought till victory.

Volume 10
After returning to the world she continued her research about the wave and helped Naofumi in raising the villagers.