And here we are with the newest arc: Great Heights!

Back in the new U.A. grounds, Momo continues to encounter her own problems, as the stress of both her work and trying to establish the Future Foundation in competition to the better funded Life Foundation. Worse, the lapses of memory that she is suffering are beginning to get worse, and the rest of the class, already rattled by Bakugo's desertion, are beginning to grow tired and lifeless, seemingly slowly losing parts of themselves and their personalities.

And from the outside, Hatsume is watching all of this with worry. Whatever is happening to her friends in Class 1-A, it's beginning to spread, first to Class 1-B, and now to even her teachers. They're all beginning to suffer from serious signs of fatigue and listlessness, and the memory problem is beginning to spread.

Something is going on, and it's scaring her.

As such, when the weekend comes, Hatsume quickly drags Momo, Sero, and Todoroki to her house and orders them to rest there for the next two days. The three of them are resistant to the idea, particularly Momo, but Hatsume becomes surprisingly firm in her demands, and they relent.

Meanwhile, Izuku begins to work with Keemia, Ochako, and the rest of the Spider-Gang to rebuild F.E.A.S.T. in the old warehouse that they had annexed for themselves, and even find help in several former residents of the old F.E.A.S.T. building, as well as Koichi, the Skycrawler, who has grown close to the Spider-Gang during his brief time in Japan.

During this time, Ochako, Keemia and Izuku grow especially close, with Ochako and Keemia helping to train Izuku to control his Anti-Venom powers, and Ochako, with Venom, teaching both Izuku and Keemia new attack moves and styles with their Anti-Venom and sand powers respectively. Whilst they do this, the three begin to bond closely, and soon begin to realise that they are all developing strong feelings for each other.

However, once again their efforts to rebuild F.E.A.S.T. are met with contention from the local heroes, who begin to harass the group and try to rile them up for a fight. The Spider-Gang annoy them, but it is clear that these pro heroes may be on the payroll for someone else. Ochako suspects a connection to the Shie Hassaikai, and decides to pass what she learnt from them during her stint in the Circle of Four to Kendo and Rappa, who are still working on the case under the payroll of Gang Orca.

But then, they recieve the news of Iida's demise, and are horrified of it, stricken by the death of their former friend.

Meanwhile, Hatsume begins to run her own investigation into what is going on at U.A., enlisting the help of fellow support student Maina Furasu to assist her. During this time, the two of them are constantly forced to avoid the gaze of Aizawa, who has grown more and more irritable as the rest of the teachers become more and more placid. Sensing a connection, the two go to talk to Shinso, who has been suffering from the same headaches and lapses in memory as everyone else, but the effects are lesser on him. Whatever is affecting the staff and student bodies, Shinso's quirk might just be giving him a level of immunity to it.

But then, they learn about Iida's death in prison, and the next day, Aizawa visits the support department. Suddenly, Hatsume suffers from a lapse in memory as she finds herself updating the security cameras, and realises that, somehow, Aizawa is the one behind these memory losses.

But when she tries to tell the teachers, all they do is tell her off for not being rational and logical.

Realising that the staff has been compromised, Hatsume fears what will happen to her, and enlists Maina and Shinso to help her begin work on suits of armour that will hopefully protect them from whatever will come next...

And elsewhere, Kendo, Rappa, and Gang Orca look over the information that Ochako has handed to them, and connects it to what they already know about the Shie Hassaikai. But then, they remember Kazuho's death and how similar it was to both Iida's demise and the former HPSC President's assassination, and they remember how Overhaul had been investigated as having a part to play in Kazuho's murder.

Then, Gang Orca remembers a case from not too long ago, as of three sidekicks from Overhaul's agency being arrested for trying to abduct Eri Morales from her home. Then, he remembers how the Circle of Four had helped to bring in one pro hero attached to Overhaul's agency whom also had connections to the Shie Hassaikai, but he had killed himself in his cell.

Then, they get a call about one or two of Overhaul's pros lurking around Eradu, and Kendo and Rappa contact Spider-Man and S.I.L.K..

Whatever connection Overhaul and the Shie Hassaikai have, it all leads to Eradu, to Eri Morales.