Simple Domain

New Shadow Style: Simple Domain (シン・「」) is an anti-domain technique that erects a small barrier around the user to protect them from the effects of a Domain Expansion.

Description
During the height of jujutsu in the Heian Era, Sadatsuna Ashiya created the "domain for the weak" in order to protect his followers from evil curses and curse users. Binding vows were established that forbid teaching Simple Domain to outsiders, but other sorcerers saw the technique in action and were able to copy it for themselves, something the bindings account for.

Created as a counter for domain expansions, Simple Domain neutralizes a domain's guaranteed-hit function by affecting its barrier and not the imbued cursed technique. However, against a proper domain expansion, Simple Domain can only hope to buy its user time. Powerful domains can destroy simple domains within seconds.

Simple Domain barriers can be customized with different rules and binding vows to affect those within it, both caster and target.

Simple Domain can also be used offensively. There are also several swordsmanship techniques within the New Shadow Style that operate around countering anyone who enters the range of the user's Simple Domain.

Usage
Simple Domain was originally meant to be passed down through the Ashiya's family and was forbidden to spread to outsiders. However, in the modern age, several sorcerers with no relation possess the ability to use Simple Domain. Kasumi Miwa was taught by her mentor in Junior High and Aoi Todo, who doesn't come from a Sorcerer Family, learned from Yuki Tsukumo.

Kasumi Miwa
Kasumi Miwa's Simple Domain creates a barrier beneath her feet that spans a 2.21-meter radius. Anyone who enters her domain will be intercepted automatically by her Batto Sword Drawing technique. If both feet leave their original position from when the domain was cast, Kasumi's technique ends. It is her main form of combat and was first showcased this ability during the Goodwill Event.

Yuji Itadori stumbled into Kasumi's domain when the Kyoto Team attacked him. However, Yuji's advanced speed allowed him to completely avoid Kasumi's automatic counter. She also used Simple Domain in her jujutsu battle with Maki Zenin, but it was once again countered by superior speed and athleticism.

Kokichi Muta
Kokichi Muta was unable to cast Simple Domain himself but he was able to imbue the technique into mechanical tubes. Using the Technique Charge function of Ultimate Mechamaru Mode: Absolute, Kokichi could use his giant armored puppet to cast the technique.

Mechamaru was able to shift the fingers on its right hand into gun barrels or spikes capable of injecting Simple Domain's effect into Kokichi's target. In Mahito's case, being hit with a projectile containing Simple Domain affected his soul because it neutralized his Idle Transfiguration technique upon detonation. Kokichi was also able to use it to protect the cockpit from Mahito's Self-Embodiment of Perfection.

Ui Ui
Ui Ui accompanies Mei Mei in battle because he's responsible for countering domains. He's capable of activating Simple Domain and neutralizing any cursed techniques as long as Mei Mei gives him permission. He did so to counter the Smallpox Deity's Domain Expansion after getting trapped in a coffin. Simple Domain nullified the disease curse's ability to bury the coffin underground with a gravestone, a technique Ui Ui would not have survived.

Atsuya Kusakabe
Atsuya Kusakabe is an elite-level user of the New Shadow Style. He reached the rank of grade 1 despite not having an innate technique thanks to his proficiency in utilizing Simple Domain. He can use the New Shadow Style swordsmanship techniques to cut down his enemies using different sword-drawing type attacks.

Kusakabe is also capable of using Simple Domain's ability to effectively cancel out other cursed techniques. He blocked Pseudo-Geto's Maximum: Uzumaki to protect his allies, prompting the immensely strong curse user to admit Kusakabe possessed quite a high degree of skill.

Aoi Todo
Aoi Todo learned to use Simple Domain from his mentor, Yuki Tsukumo. He attempted to use it to nullify the effects of Mahito's Self-Embodiment of Perfection. However, the domain was only deployed for 0.2 seconds, slightly too fast for Aoi to counter.

Rokujushi Miyo
Rokujushi Miyo's Simple Domain creates a sumo wrestling ring where he must receive his opponent's permission to engage in order to complete his barrier. Agreeing to a sumo match avoids the need for any binding vows and results in a pure sumo bout within the simple domain.

As a result of the removal of any binding vows, time flows faster inside Miyo's barrier. The time it took for he and Maki to engage in 1,000 bouts within the domain only amounted to a few seconds outside of it.

Yuki Tsukumo
Yuki Tsukumo could use Simple Domain in addition to having the ability to expand her own domain. She was skilled enough at the technique to pass down her knowledge of it to Aoi Todo, who can also perform the technique. While Yuki can use simple domain to neutralize a can't-miss attack within a domain, it only bought her a few short seconds against a powerful domain such as Kenjaku's Womb Profusion.

Satoru Gojo
Satoru Gojo used Simple Domain in his fight against Sukuna to counter Malevolent Shrine's sure-hit effect. While he is unable to teach the technique to others, due to his genius intellect, he was able to perform the technique. He used this to defend himself against Malevolent Shrine's slashes while simultaneously healing himself using reverse cursed technique. As soon as his simple domain dispelled, he conjured another one immediately.

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