What happens
Nanami works out that the two of them have to make openings for each other, and for a while it works. 
MahitoMahitoSpecial Grade · Cursed SpiritA cursed spirit born from humanity's hatred and fear of each other. Mahito's Idle Transfiguration allows him to reshape souls through physical contact, and since the body follows t... shapes an arm into a blade, then into a ball of spikes he immediately regrets, then shrinks to child size to survive a hit from Yuji. That last one gives him away. His cursed energy spikes just before he changes shape, so the timing becomes readable and the pair start landing everything.
He coughs up transfigured humans in the shape of children and sends them at Yuji, betting that Yuji cannot swing at them. Yuji does, and gets back in time to pull Nanami off the wall.
Being beaten to the edge of death gives MahitoMahitoSpecial Grade · Cursed SpiritA cursed spirit born from humanity's hatred and fear of each other. Mahito's Idle Transfiguration allows him to reshape souls through physical contact, and since the body follows t... the thing he has been reaching for. He opens 
Self-Embodiment of PerfectionSelf-Embodiment of PerfectionDomain ExpansionInside Mahito's domain, Idle Transfiguration is guaranteed to hit. That's the whole story. The domain traps the target in an enclosed space, and the sure-hit effect applies soul ma... and takes Nanami inside it, which is a guaranteed kill, and Nanami spends what he assumes are his last seconds thinking about a bakery and the woman who worked there. Yuji breaks in from outside, because a barrier braced against the inside is thin from the other direction, and Mahito'sMahitoSpecial Grade · Cursed SpiritA cursed spirit born from humanity's hatred and fear of each other. Mahito's Idle Transfiguration allows him to reshape souls through physical contact, and since the body follows t... hand lands on 
Sukuna'sSukunaSpecial Grade · HumanThe King of Curses. A thousand years ago, Sukuna was a jujutsu sorcerer so powerful that other sorcerers of the golden age couldn't defeat him even working together. His cursed tec... soul instead. SukunaSukunaSpecial Grade · HumanThe King of Curses. A thousand years ago, Sukuna was a jujutsu sorcerer so powerful that other sorcerers of the golden age couldn't defeat him even working together. His cursed tec... opens him up out of pure irritation.
MahitoMahitoSpecial Grade · Cursed SpiritA cursed spirit born from humanity's hatred and fear of each other. Mahito's Idle Transfiguration allows him to reshape souls through physical contact, and since the body follows t... gets away into the sewers and decides he will kill Yuji's soul as many times as it takes. In the morgue afterwards, Nanami tells Yuji that nobody can be guided to a proper death, and calls him a sorcerer.
Fights
Yuji & Nanami vs. Mahito
Manga chapters adapted
- Chapter 30
- Selfishness
Volume 4
- Chapter 31
- Tomorrow
Volume 4