Gege Akutami built a power system in Jujutsu Kaisen that rewards careful reading and punishes lazy writing. Here is why cursed energy works better than any modern shonen magic system.
The foundation: Cursed energy comes from negative human emotions — fear, anger, grief. Jujutsu sorcerers channel this energy into cursed techniques. Every sorcerer has ONE innate technique determined at birth. You cannot learn new ones. Source: JJK Chapter 12, Gojo's explanation to Yuji.
Why the limitations matter:
- In Naruto, characters collect jutsu like Pokemon. By the end, Naruto has 50+ techniques. In JJK, Gojo Satoru has one technique — Limitless (Mugen) — and the story explores every permutation of that single ability across 200+ chapters.
- Domain Expansion is the ultimate technique. It creates a pocket dimension where your cursed technique has guaranteed hit. But it has rules: you cannot use your technique for a period after the domain collapses (Chapter 171), two domains can clash and cancel each other (Chapter 15), and a simple domain or falling blossom emotion can counter it (Chapter 106).
The Binding Vow system: Sorcerers can make binding vows — restrictions on their power in exchange for amplification. Gojo's Hollow Purple requires specific hand signs that slow him down but dramatically increase power. Mechamaru traded his physical health for massive cursed energy reserves (Chapter 38-39). Todo traded his memory for a guaranteed hit.
Why this is peak battle manga design: Every fight in JJK is a tactical puzzle. Yuji vs. Mahito, Gojo vs. Jogo, Megumi vs. Reggie Star — each fight is won by the character who better understands and exploits the RULES of cursed energy. There is no "I believed harder so I got stronger." There are rules, and the cleverest fighter wins.
The Sukuna vs. Gojo fight (Chapters 222-236): The culmination of the power system. Two sorcerers with perfect understanding of cursed energy fighting at the absolute ceiling. Gojo uses Unlimited Void. Sukuna uses Malevolent Shrine. The domain clash mechanic introduced 200 chapters earlier determines the outcome. This is long-form battle manga plotting at its finest.
Sources: Jujutsu Kaisen manga (Viz Media), chapters cited, Gege Akutami's author notes
The Binding Vow system is the most elegant power restriction mechanic in shonen. It means every power-up has a cost. You cannot just "unlock" a new form. You have to sacrifice something. Akutami understood that limitations create better stories than power fantasy.