And here we are, onto the next arc, that I hereby dub: The Other!

Meanwhile, U.A. has approved for its students to finally go out on their work studies, and Tsuyu ends up getting a place in Air Jet's agency, which has ties directly to S.I.L.K., an organisation that Tsuyu has mixed feelings about, due to its both bringing new laws and governance to Japan in the wake of the HPSC's downfall, and yet also due to their employment of Spider-Man as a licensed hero, one that has been approved of without going through the proper channels and protocols, which is already a controversial decision if it wasn't for Spider-Man's notorious background on top of that.

However, Tsuyu eventually learns that she's been chosen by Air Jet as part of a mission that he's been tasked with by Adriana up the chain: as a member of Class 1-A, and with a former working relationship to Spider-Man on top of being judged as a model student and follower of the rules, Tsuyu is to find the renegade clone Kaine Parker and his team of Enforcers, gain their trust, and lure them into a trap to be arrested for their various illegal vigilante and villain actions, as well as their snooping into and interfering with S.I.L.K.'s operations on top of having avoided countless tricks and traps by the heroes before.

Tsuyu is nervous and frightened of partaking in such a mission, but at the prospect of a group of dangerous criminals going free, she accepts.

As such, with the help of Air Jet and his fellow agency members, Tsuyu is planted in an area where the Enforcers were sighted in, and is put into a simulated position where one of the agency members would pose as a random villain attempting to attack Tsuyu, so that Kaine could get the jump on him, 'Rescue' Tsuyu, and allow her to gain his trust and lead him into a trap that he can't escape from.

However, in the middle of this simulated mugging, the agency member with Tsuyu is shot in the back of the head and severely wounded…

By Iida, the Punisher, who is targeting members of S.I.L.K. as well, as punishment for being false heroes.

At this point, Iida has been fully corrupted by his anger and hatred, and had been completely subsumed by his role as the Punisher. In an ultimate act of irony, he has become identical to Stain, to the Hero Killer that he hates so very much.

Iida goes to attack Tsuyu as well, proclaiming her to be just as much a fake as the man that he just killed, only for Kaine to finally interfere and brutally beat Iida, driving him away with his tail behind his legs. He then spots the injured man on the ground, and webs up his wounds, sealing them and calling an ambulance to pick him up, though he is awfully crude about it.

Kaine then notices a shaken, traumatised Tsuyu standing there, horrified by the maiming of the man that she had just been talking to, but not wanting to deal with that, he begins to walk away.

Tsuyu, still haunted by the sight of her friend having been turned into a murderer, and the man she was talking to coming close to death's door, resolves not to let his efforts be in vain and goes to follow Kaine, now firmly resolved on completing her mission and also bringing Iida to justice for what he has done.

At first, it is difficult, but it ends up not being as hard as Tsuyu, who is still running on the emotional storm that Iida's maiming of that man has sent her on, had thought it would be to get into Kaine's inner circle, that being the Enforcers, and she ends up rolling with them on their missions to investigate whatever is going on with S.I.L.K., learning that the reason that they are looking up the organisation is because of the amount of formerly HPSC members that are in it, as Kaine suspects that the only reason that the Jackal, the recently deceased former HPSC President, was able to amass as much power as she had from within her cell was because Adriana and her fellows were interested in thinning the herd and getting rid of those that they considered expendable.

However, Tsuyu herself would also find herself hunted by Iida as well, who was murdering S.I.L.K. agents for the agency employing the false hero Spider-Man into their ranks. Tsuyu is horrified by this, and has more than a few close calls with her former classmate as she learns more about Kaine's investigations, eventually learning that he is trying to track down Doctor Octopus and figure out where he has gone, alongside what S.I.L.K. is planning to do with the Infinity Stones and the Infinity Glove, and what truly happened during the supposed riot and attempted breakout at Tartarus.

And it is here that we finally get a look into Tsuyu's character and backstory, and why she is so adamant about following the rules:

A long time ago, when she was very young, her family had been screwed over by a vigilante. Her parents were lawyers, and they had instilled into her a strong sense of right and wrong from the very start. However, as lawyers, they had also gained their fair share of enemies, particularly a vigilante that they had brought to justice, a Japanese nationalist by the name of Sunfire, who had sworn vengeance against her family for stopping what he considered to be a glorious crusade in the name of his country.

As such, one night, he attacked their home, and burnt it to the ground. Tsuyu was able to escape, as was her mother and father. However, her grandparents weren't lucky enough to escape, and they were killed by the violent vigilante before he was arrested and taken away. Tsuyu had developed a strong sense of right and wrong about the law in response to Sunfire's attack and the death of her grandparents, and has grown to become unwilling to bend or break when it comes to her morals on top of her sense of distrust and dislike toward vigilantes because of the attack. All of this proves to put her at odds with Kaine's much more morally dubious and brutalist way of helping those in need and fighting injustice, all of which reminds Tsuyu way too much of Sunfire.

Soon enough, Kaine comes up with a plan to lure Iida out of hiding and tag him for capture, allowing them to learn where he is getting his weapons from and who is helping to fund him on this quest of his, as Kaine suspects that it is someone from the old HPSC Remnant, a former HPSC operative within S.I.L.K., or even someone else within S.I.L.K. as well, and Tsuyu, not believing Kaine and still not trusting him, feeds this information to Air Jet and his agency.

However, then, it is revealed that Kaine knew that Tsuyu was a plant all along, and was feeding her false information and digging for intel from her himself. He knew that he was leading them on, and now that he's got everything that he needs out of Tsuyu, he no longer has any use for her.

Except as bait for Iida.

So, he knocks her out and leaves her out in the open, covered in webbing, waiting for Iida, whom is too consumed by his own directionless anger and hatred to see that this is a trick, and goes to hide…

And soon enough, Iida takes the bait.

Kaine attacks Iida just before he stabs Tsuyu, and Iida begins to battle against the Enforcers, using his quirk to speed around them and keep himself on equal footing with them. Kaine is able to throw Tsuyu out of the way and keep her out of the line of fire, as Iida decries Tsuyu for working with Kaine, a Spider-Man, and his Enforcers, believing her to be just as villainous as they were.

Like said before, Iida's thought processes have become identical to that of Stain's, as his quest for vengeance and justice against those who have done wrong to him, alongside the unfortunate circumstances that have been forced upon him, have led him to walk down the same path as the Hero Killer himself. The use of the Hero Killer's sword and his adopting of the title of Punisher has only led him further down that road.

Soon enough, it is only Iida and Kaine left in the fight, and here is where we get into Kaine's perspective as well, and how much of a foil he is to both Iida and Tsuyu in how his own past and traumas, particularly as one who has killed his fellow clones, people that he could consider to be brothers and sisters, and how it has informed his own brutalist mindset and methods. Kaine has run out of room for niceties a long time ago, back when he first spilt the blood of one of his fellow clones. He no longer sees any point in being polite or respectful to others, and has much less in the way of patience or willingness to give forgiveness to others. Sure, he's a good guy, and he's not about to let innocent people get hurt… but he doesn't have the same unwillingness to kill as Peter, and doesn't have his tolerance for other people's BS as well.

He's lost too many of his brothers and sisters, by his own hands, to turn back now.

Kaine and Iida end up beating each other into a pulp, but Iida is able to use his quirk to boost himself away from the fight and flees, and Kaine is left covered in his own blood, swearing to himself before picking up the battered forms of his fellow Enforcers and leaving with haste…

Leaving Tsuyu on her own, forgotten like battered luggage.

Soon enough, Air Jet would arrive, and his fellow S.I.L.K. agents would bring the wounded girl back to their agency to heal. Once that is done, she gives her statement, and is sent off on her way.

All the while, she feels herself growing angry at Kaine for how he treated her like trash, like that vigilante murderer Sunfire had, and how Iida had given himself over to violence and murder as well. Her entire experience has only served to further galvanise her against vigilantism and breaking the rules.

As such, when she is contacted by Adriana Soria herself to be her eyes and ears within U.A., she thinks back to Momo, how she has taken up the mantle of Spider-Man, then thinks back to Kaine, then Sunfire, and then accepts.

But unbeknownst to her, Kaine was right in that Adriana had allowed the Jackal to form the HPSC Remnant as a way of pruning out the weakest links in her organisation, and had much bigger plans for the Infinity Stones…

But now, Kaine has her scent.

Yeah, Kaine's never really been good at the whole 'Acting like a hero' thing, has he? He's definitely a good guy, but he's not afraid to toss people around, and definitely not fond of the whole 'Forgiveness' thing that Peter has going on.

Unfortunately, in the world of MHA, that kind of attitude isn't going to win him any support from people who don't know him well, especially people like Tsuyu who are not as willing to skirt and bend the rules as he and every other spider is. In fact, I'd go as far as to say that his attitude would only serve to galvanise people against him, as has been demonstrated here with the aforementioned Tsuyu...