Yuji Itadori vs. Ko-Guy

Yuji Itadori vs. Ko-Guy is a battle fought by Tokyo Jujutsu High student Yuji Itadori against the grasshopper curse Ko-Guy guarding the commissioned curtain inside Meiji-Jingumae Station B2F.

Prologue
The Mei Mei Team is assigned with heading to Meiji-Jingumae Station after a second curtain is cast from there. Mei Mei uses her crows to inspect the inside of the station and explains the situation to Yuji.

The curtain trapping civilians is surrounding the entire substation from B1F down to B5F. The second curtain prevents sorcerers from entering B5F and there are transfigured humans on B4F funneling civilians down to the Fukutoshin Line Platform on B5F. Mei Mei's crows were attacked between B1F and B2F, meaning the curtains caster is hiding there.

Mei Mei reluctantly decides to split up with Yuji in order to save any remaining non-sorcerers on B4F. Yuji enters exit 2 and heads to find the caster on B2F while Mei Mei enters exit 7 on the opposite side and heads straight to rescue the civilians.

At 9:03 P.M. on B2F, Yuji finds a large bipedal grasshopper curse devouring a deceased man's head. Ko-Guy turns and notices Yuji, asking what the jujutsu sorcerer is looking at. The curse is capable of speech albeit barely and reveals to Yuji that it's "smart".

Yuji asks about the patch face curse controlling the transfigured humans and the grasshopper confirms Mahito is down below. He also mentions that he's here to protect the curtain. The wording makes Yuji realize the stake wrapped in talismans sticking out of the ground is likely the source of the curtain.

Ko-Guy adds Mahito's jujutsu is no good because it makes humans taste worse. It also reminds Yuji that he can tell the difference because he's smart.

Battle
Yuji interrupts the grasshopper's repeated thought about being smart with a hard right head kick that sends the curse reeling back. Ko-Guy slams into the wall behind him and cracks the surface from the impact. Yuji immediately uses the momentum from his kick to turn three hundred and sixty degrees before throwing a left straight punch to his opponent's body. With his hand still smoking from the impact, Yuji demands that all curses stop looking down on humans.

Ko-Guy recovers from the heavy hits and claims Yuji must not be smart. The grasshopper asks if the sorcerer knows what kind of curse he is and it's obvious enough to Yuji, surprising him with how smart the sorcerer is.

Using his jumping power to increase his speed, Ko-Guy moves rapidly around the subway corridor attempting to bite Yuji with his jaws. Yuji is able to avoid him but he takes note of his opponent's ability to communicate as well as his physical prowess, recognizing he's a more powerful type of curse. Ko-Guy rushes beside Yuji and throws a left straight punch but Yuji twists his body under and slips away to avoid the attack.

Yuji recognizes that it's more likely that the curse will focus on using his limbs and his bite to fight at close combat rather than utilize sneaky tactics. Ko-Guy asks Yuji if he's smart or not and the sorcerer replies by revealing to him that smart people don't usually talk about being smart, shocking the curse.

Yuji leads the next exchange with cursed energy reinforced left straight punch. The curse believes he has the advantage as they exchange rapid punches because he has four arms compared to Yuji's two. However, Yuji uses successful parries to twist up the grasshopper's arms amongst themselves. This leaves his body wide open to a barrage of rapid-fire straight jabs that Yuji leads up to his opponent's face, pummeling Ko-Guy's face with ease. The curse believes himself to be physically superior to Yuji, so he doesn't understand why he's the one getting beaten down.

The grasshopper attempts to use his black mucus to hit Yuji, spitting it at the sorcerer and forcing him to duck under. Yuji switches levels to deliver an uppercut, but Ko-Guy attempts to strike his opponent's head while it's low. He expands his abdomen and the hard tip at the end in an attempt to drill a hole in Yuji's face. However, Yuji parries the attack away with his left hand and follows up by severing the appendage completely with a ring-handed downward punch.

Yuji recognizes that he does use sneaky attacks, but there is a gap in their skill no amount of tactics can make up for in this fight. Ko-Guy ate people, so Yuji uses that to fuel his resolve and asks the curse if he has any last words before exorcising him.

Aftermath
Mei Mei finishes up rescuing the civilians on B4F from the transfigured humans with Ui Ui. They both notice when the curtain dispels after Yuji breaks the cursed object maintaining the barrier.

At 9:15 P.M., Yuji regroups with Mei Mei and Ui Ui on B4F and they immediately head down to the B5F on the Fukutoshin Line Platform. They arrive too late, however as Mahito is already gone and there is only one civilian remaining. They can only say that everyone was on the train with monsters but they didn't want them before dying of sudden transfiguration.

The person's words make Yuji realize everyone on the train must be headed straight for Gojo.