A Disturbance in the Forest Arc[]
She attacked Rimuru after believing that they were the one responsible for the Ogre Village's destruction, but soon allies with them after learning the truth and was named along with the others after Benimaru accepted Rimuru's offer of servitude in Rimuru's kingdom of Tempest.
Attack of the Demon Lord Arc[]
She, her comrades, and Rimuru soon befriended Demon Lord Milim Nava and faced off against Phobio, one of Carrion's minions.
Human-Monster Interaction Arc[]
She remained in Tempest for the time being when Rimuru left for the Freedom Academy.
A Demon Lord's Awakening Arc[]
Due to the one hundred invading Falmuth vanguard knights accompanied by their three Otherworlders and the Prison Field barrier placed around Rimuru City, Shion was weakened significantly and ended up dying protecting a child during the invasion. However, she was later revived by Raphael and her Harvest Festival gift enabled her to evolve into a Wicked Oni. She also had Falmuth's king and his subordinates, who were captured by Diablo, brutally beaten for attacking Tempest. During the Harvest Festival, she wished for her cooking to be delicious, thus obtaining the Unique skill Cook.
The Octagram Soars Arc[]
During the Walpurgis, Shion fought against Clayman and completely overpowered all his attacks.
Scarlet Bond Arc[]
She accompanied Rimuru to the Kingdom of Raja.
Conflict Between Saints and Monsters Arc[]
When the Holy Knights were marching to Tempest to kill Demon Lord Rimuru because of a misunderstanding. Shion pushed back against several members of the Ten Great Saints on her own, completely deflecting all their attacks and breaking through a Holy Purification Barrier with her odachi Hercules' Edge. She later fought the Seven Luminaries and manages to disable their Magic Circle.
Territory Seizure Arc[]
Shion defeated all three of Demon Lord Dagruel's sons when they came to Tempest to challenge Rimuru without even unsheathing her odachi. Later, they became her students. She at one point planned to compete with Shuna for Rimuru's attention.
Opening of the Monster City Arc[]
She helps prepare for the upcoming festival and also has interest in fighting Masayuki and his party before Rimuru talks her out of it. She and Shuna later take part in a concert performance. She is later among the audience watching the martial arts tournament and becomes a part of the Big Four, but is not allowed to take part in the competition as she would easily win. When Muese intends to take control of Tempest's financial business, she and Diablo are aware of his true motives, but his ploy is nevertheless foiled.