Sion Ogura is a genius but very eccentric high school girl in The Demon Girl Next Door. She loves the occult and black magic, and even though she does strange and chaotic things, she is one of the smartest students in her grade. Sion is known for her wild experiments and crazy ideas, like making mysterious potions and always looking for creepy new research. Despite her madness, her actions often help the main characters during tough times, making her a hidden MVP (Most Valuable Player) in the story.
Sion Ogura is 15 years old and attends Sakuraoka High School as a first-year in Class C.
She is 154 cm tall.
Her birthday is December 14, and her blood type is A.
She has long black hair with a ribbon tied around her head and wears glasses.
Sion is a true mad scientist.
She loves the occult and black magic and always wants to do experiments on everyone, especially Yuko Yoshida (Shamiko).
Sion is very quirky, chaotic, and unpredictable—Anri Sata says you need a self-defense weapon just to talk to her.
Despite this, she is brilliant and always gets top marks (except ethics).
She is very indoor and has little physical strength, sometimes even less than Shamiko.
Sion is also very cunning, always searching for the town’s hidden secrets and sometimes helping just to get what she wants.
She is mentally fragile; if things get scary or dramatic, she tries to run away or freezes up.
Sion Ogura goes to Sakuraoka High School and is in Class C.
She is good friends with Anri Sata, although nobody knows how they met.
She created a “Black Magic Club” at school and uses classrooms and equipment without permission.
Because her grades are so good, the teachers mostly ignore her odd behavior.
Sion is a master of strange science and magic, mixing dangerous potions and making weird gadgets.
Many of her inventions actually work, like a special herbal potion that boosts magical power for a day.
She has deep knowledge of magic, rituals, and all sorts of supernatural things.
- Yuko Yoshida (Shamiko): Sion is fascinated by Shamiko and always wants to experiment on her. She sees Shamiko as an interesting test subject.
- Anri Sata: Sion’s friend, although Anri thinks Sion is a bit too crazy.
- Momo Chiyoda and others: Sion helps them with advice or strange inventions, usually when it also benefits her research.
- Ryoko Yoshida: Shamiko’s little sister, likes and trusts Sion.
Meeting Shamiko and The Black Magic Club
Sion first meets Shamiko and offers her help by presenting a strange potion that boosts magic. She immediately wants to experiment and collect data from Shamiko.
Crazy Experiment Ideas
Sion always tries to do wild things like taking Shamiko’s blood, running electric currents through her, or giving her bat wings. Most of these plans are stopped by Momo Chiyoda.
The Summer Experiment Festival
When Momo falls to darkness, Sion calls the rescue plan a "summer excitement experiment" and dresses as a medieval doctor for fun. She uses her lab (which she borrowed from the school without permission) and gives everyone a "weird medicine" that Momo says humans should never eat.
Moving Into Shamiko’s Attic
After the Black Magic Club room is destroyed because of Mikan Hinatsuki’s curse, Sion secretly moves into the attic of the Bandaso apartment, where the Yoshida family lives.
Secret Investigations and Dark Rituals
Sion spies on the sealed Lilith idol and patrols around Shamiko’s house five times a week. She helps Shamiko and Momo find the secret spring of Sakura Chiyoda and sometimes appears from the attic to give hints. She even makes a "corruption stabilizer" out of a rare pink jade stone, which she takes from Shamiko without asking.
Strange Proposals and Inventions
Sion casually comes up with ideas for weapons or strange drugs, like a potion that could steal a magical girl’s power (which is rejected by her friends).
She glues a help button to the apartment for emergencies and gives Shamiko creepy handmade dolls.
Sion even tries to get hair from Shirosawa without asking and marks up the walls with magical seals.
Comic Relief and Hidden Help
While Sion’s wild moves worry her friends, her inventions and actions always help out in the end. She often appears at just the right time with the perfect potion or advice, turning disaster into success.
- Sion’s name may be inspired by the demon Gusion from the 72 demons of Solomon’s Lesser Key, matching the series’ theme of using biblical names.
- In the anime’s second season, Sion appears earlier and more often than in the original manga, usually seen sneaking around with large experiment bags or observing people mysteriously.
- She is extremely indoor and hates going outside, especially to mountains or crowded places.
- When facing dramatic situations or fights, she panics and tries to escape, using the same excuse as she uses for hating outdoor activities.
"This is a win-win situation, right? Isn’t it wonderful? Let’s look into the abyss together!!"
- Sion’s strange actions, while scary or confusing, almost always lead to the best outcome for everyone, making her a secret MVP in the story.
- Fans online are always trying to guess which secret places Sion is investigating and why she worries if the barrier collapses.
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