Kasumi has long, light blue hair with that extends past her shoulders and frame her forehead. She also has dark, triangular eyebrows and asymmetric bangs.
Kasumi wears a black, long-sleeved jacket over a light-colored button-down shirt and a black tie, pants, socks, shoes, and a belt that she uses to hold her sword.
While training, Kasumi has her hair tied in a ponytail and wears a dark-colored track suit.
Kasumi is a kind hearted, hard-working girl who isn't as jaded as some of her classmates. She's much more restrained, down to earth, and behaves otherwise normally. Kasumi wants to be a sorcerer to make money and is a fan of famous sorcerers like Satoru Gojo. Despite being ordered to do so by the principal Yoshinobu Gakuganji, Kasumi was uncomfortable about her class' attempt on Yuji Itadori's life and apologizes for it later. The reason she tries so hard to succeed at Sorcery is because she wants to support her two younger brothers, showing her caring and steadfast attitude.
She constantly calls herself useless and genuinely fears that her weakness causes trouble for others trying to protect her. Kasumi admits to gripping her sword tightly out of fear of dying; however, with the right motivation, she is willing to risk her life against a stronger enemy.
Kasumi was born in Tokyo, coming from a poor family with two younger brothers. She was the captain of the youth basketball team and her mother would often dye her hair black. In Junior High, she met a mentor who would allow her to become a jujutsu sorcerer. Although she had never held a sword before, she trained so that she wouldn't be a burden to her mother.
Kasumi accompanies principal Yoshinobu, as his secretary, to a meeting with principal Masamichi Yaga. As Yoshinobu talks with Gojo, Kasumi thinks about how cool Gojo is while they wait for Masamichi. Kasumi is shocked when Gojo tells them that Masamichi will arrive in 2 hours, as he is leaving. When Yoshinobu tells her to go get him some tea, Kasumi obliges while hoping to get a picture with Gojo. She is able to get a photo with Gojo but forgets about the tea.
On the day of the Kyoto Goodwill Event, Kasumi accompanies the Kyoto students and faculty to Tokyo college. After encountering the Tokyo students, Kasumi is glad of Gojo's arrival and is even given a souvenir from his trip. Afterwards, Kasumi attends a meet with the other Kyoto students and principal Yoshinobu. Yoshinobu tells them to kill Sukuna's host, Yuji, during the event, which Kasumi silently protests. After Aoi Todo and Yoshinobu leave, Kasumi talks with the other student on how they should handle the event.
When the event starts, Kasumi and the others locate Yuji and surround him. As Mai Zenin draws Yuji to her, Kasumi goes to attack him but Yuji manages to evade her. As Aoi forces the Kyoto students to retreat from killing Yuji, Kasumi is glad about that. When Kasumi retreats with Noritoshi Kamo, both of them encounter Megumi Fushiguro and Maki Zenin.
As Kasumi takes on Maki, Maki wonders why she separated from Noritoshi. Kasumi tells Maki that she wants to use this event in order to get promoted and help out her family. After talking, Kasumi and Maki continue to fight, with neither holding back. As Kasumi fights Maki, she notices that Maki is much stronger then what Mai had told her. As Kasumi is put on the defensive by Maki's attacks, she decides to take a stance in order to counter. When Maki breaks her weapon, Kasumi wonders how she did that. As Maki throws a part of her broken weapon at Kasumi, Kasumi easily blocks it but notices that Maki had thrown a kunai. When Maki gets close, Kasumi defends herself. Kasumi notices that her feet have moved and plans to get back into position, but Maki tosses Kasumi and even disarms her. Kasumi asks for her sword, but Maki refuses and leaves.
As Kasumi wonders what to do, she suddenly gets a call from Mechamaru. As she answers the phone, Toge Inumaki is on the other side and puts her to sleep. When intruders invade the event, Kasumi is still fast asleep.
After the invaders have been dealt with, Kasumi attends a meeting and agrees with the others to continue the event. One the second day of the event, Kasumi plays baseball with the others. After the event is finished, Kasumi heads back to Kyoto along with the students and faculty.
Sometime later, Kasumi informs Mechamaru that their notebooks are due that day. After telling Kasumi where his notebook is and that he will be asleep for a bit, Kasumi pokes Mechamaru and wonders where his real body is at. Later, Kasumi talks with Mechamaru and informs him that she wishes to get closer to him along with meeting with him in-person one day.
Kasumi is given privacy on the train to Shibuya as she holds onto the last device that Kokichi is talking through. He tries to convince her that the battle will end soon and she should turn back. Kasumi asks Kokichi why it's only Aoi Todo and Arata Nitta. Kokichi explains that there's a 99% chance that Aoi would survive and that Arata's cursed technique is useful. Kasumi suddenly asks if she was so weak that he needed to act in secrecy and ensure they wouldn't be available on 31st; Kokichi refutes, saying he was truly weak for making these mistakes. While he's in the middle of talking, tears suddenly sprout from Kasumi's eyes as she hugs the device. When Kokichi tells her that it's time to say goodbye, Kasumi tearfully begs for him not to leave. Kokichi tells her that he did truly love her and asks for her to find happiness, no matter how she does it; as long as she's happy, his wish will become true. She starts crying in the train.
When the Kyoto team ambush Pseudo-Geto, Kasumi manages to get behind him and unleash New Shadow Style: Batto Sword Drawing. Even though she puts everything she had into the attack, Geto effortlessly destroys her sword with his bare hands and uses Maximum: Uzumaki at point-blank range. Kasumi is protected by Momo Nishimiya, Utahime Iori, and Atsuya Kusakabe, whom Kasumi recognizes. She and the others are later frozen in place by Uraume's Frost Calm attack but are saved by the timely arrival of Yuki Tsukumo.
Abilities and Powers
Overall Skill Level: Kasumi is a grade 3 sorcerer capable of using the New Shadow Style swordsmanship techniques. Her lack of an Innate Technique makes it difficult for her to stand up to some her fellow jujutsu students, as she was completely overpowered by Maki — someone with advanced levels of physical prowess.
Expert Swordsman: Kasumi wields a katana as her main weapon in battle. She has studied Iai sword drawing techniques and is capable of incorporating jujutsu into her swordsmanship.
Battles & Events
- Kasumi's surname contains the kanji for "three" (三 mi?) and "ring, loop" (輪 wa?) and is a homonym for a word that means someone who follows trends, while her first name contains "mist" (輪 kasumi?).
- Kasumi ranked 11th place in the manga's 1st Character Popularity Poll with 4,923 votes.
- Kasumi ranked 17th place in the manga's 2nd Character Popularity Poll.
- During the omake at the end of episode 15 of the anime, characters are asked to answer the question "What's your type?". During Kasumi's turn, she answers with embarrassment: "An average good looking guy, but the important thing is that he has to be a person I have fun being around and someone who I think is the only one for me".
- In the English dub, both Kasumi and Maki Zenin are portrayed by Allegra Clark.
- According to Jujutsu Kaisen Official Fanbook:
- Enrollment method: Scouted.
- Her hobby is saving money.
- Favorite dish: Stew.
- Least favorite dish: Chinese parsley.
- Cause of stress: None