Introduction to Mai Zenin and the Zenin Clan
In the world of Jujutsu Kaisen, the Zenin Clan stands as one of the Three Great Families, known for their immense power, rigid traditionalism, and a ruthless obsession with powerful cursed techniques. However, this prestigious lineage is often a source of suffering for those who do not meet its exacting standards. Mai Zenin, the younger twin sister of Maki Zenin, was born into this environment of high expectations and systemic cruelty. While the clan values strength above all else, Mai’s journey is defined by her struggle to find her place within a family that viewed her as a failure. Unlike her sister, who possessed no cursed energy, Mai was born with the Construction cursed technique, a rare but incredibly taxing ability that would eventually shape her tragic destiny.
Understanding the Construction Cursed Technique

The Construction cursed technique is a sophisticated and rare ability that allows a sorcerer to create something out of nothing. While most cursed techniques involve manipulating energy or manifesting ephemeral spirits, Mai Zenin uses her cursed energy to create physical, tangible matter. Once an object is created using this technique, it does not disappear like a typical shikigami or energy construct; it remains in the physical world as a permanent item. This fundamental difference makes Construction a uniquely versatile but extremely difficult technique to master. Mai primarily uses this power to create ammunition, ensuring that she is never truly unarmed, even when her physical supplies run low.
Limits and Cursed Energy Consumption
Despite its theoretical potential, the Construction cursed technique is hampered by its extreme cursed energy consumption. Creating physical matter from scratch requires a massive amount of energy, which places a severe strain on the user’s body. For Mai Zenin, this limit is particularly restrictive. Due to her relatively low reserves of cursed energy, she is typically only able to construct one small object, such as a single bullet, per day. This limitation forces Mai to be incredibly strategic and precise with her usage. Attempting to create anything larger or more complex could lead to total exhaustion or even death. This constant battle with her own biological limits is a recurring theme in her character arc, highlighting the gap between her potential and the harsh reality of her power.
Signature Weapon: The Specialized Sniper Rifle
To compensate for her limited cursed energy and the taxing nature of her technique, Mai Zenin utilizes a specialized sniper rifle as her primary weapon. By using a firearm, she can engage enemies from a distance, minimizing the need for direct physical confrontation where she might be at a disadvantage. Her sniper rifle is more than just a tool; it is an extension of her tactical mind. Mai often uses real bullets for most of her shots, saving her Construction cursed technique to create a "surprise" bullet when her opponent believes she has run out of ammunition. This psychological warfare, combined with her expert marksmanship, makes her a dangerous opponent in long-range engagements.
The Truth Behind the Twin Restriction in Jujutsu Kaisen
One of the most profound lore revelations in the series is the nature of the twin restriction. In the world of jujutsu, twins are considered a single individual split into two bodies. This spiritual connection creates a unique phenomenon where the progress or state of one twin directly affects the other. For Mai and Maki, this meant that Mai’s possession of a cursed technique and cursed energy acted as a ceiling for Maki’s physical prowess. As long as Mai lived, Maki could never fully realize the potential of her Heavenly Restriction. Conversely, Mai’s own growth was stunted by Maki’s lack of energy. This twin restriction is a tragic bond that fundamentally limited both sisters, forcing them into a cycle of mutual stagnation until a drastic sacrifice was made.
Mai Zenin’s Legacy and Impact on Maki
The legacy of Mai Zenin is ultimately one of sacrifice and transformation. Recognizing that they could never truly thrive while bound by their shared fate, Mai chose to give her life to unlock Maki’s full potential. In her final moments, she used the last of her energy and her Construction cursed technique to create a powerful cursed tool for her sister: the Split Soul Katana. This act not only provided Maki with a weapon capable of challenging the strongest sorcerers but also severed the spiritual tie that held Maki back. Through her death, Mai effectively "took" the cursed energy and the technique with her, allowing Maki to achieve the same level of physical perfection as Toji Fushiguro. Mai’s impact is felt every time Maki wields her blade, serving as a permanent reminder of the love and pain shared between the sisters.
Conclusion
Mai Zenin’s story is a poignant exploration of talent, family pressure, and the cost of power in the jujutsu world. Her Construction cursed technique, while limited by her own energy, was a testament to her inherent potential. However, it was her understanding of the twin restriction and her ultimate sacrifice that truly defined her greatness. By choosing to empower her sister, Mai transformed from a cynical outcast of the Zenin Clan into the catalyst for its eventual downfall. Though her life was marked by struggle, her legacy lives on through Maki, proving that even in a world of curses, the bond between siblings can forge something indestructible.