Chapter 346

Super Hyper Unfair Broken Stage (スーパーハイパークソハメステージ) is the three hundred and forty-sixth chapter of Kohei Horikoshi's My Hero Academia.

Summary
Dynamight, Suneater, Nejire Chan, Edgeshot, and Mirko arrive at the now floating U.A. fortress. Best Jeanist asks what happened to Deku, with Dynamight explaining he got dragged off somewhere; Suneater and Nejire want to warn everyone, while Mirko just wants to fight "history's deadliest villain".

"Tomura Shigaraki" realizes that they're now floating in the sky, and that he was the only one warped here, telling "himself" not to take over this time, Decaying the ground to create a shockwave toward the Heroes. However, instead chunks of metal blast itself into the air, knocking "Tomura" into the electromagnetic barrier above, freezing him long enough for Best Jeanist to grab ahold of him with his carbon fibers, tossing him back onto the battlefield.

Best Jeanist explains that no matter how superhuman he may be, a strong enough current will cause his body to stiffen up momentarily, giving them just enough time to react. Breaking free from the fibers, "Tomura" realizes that the segment had sprung up the decayed ground into the air, causing it to disintegrate freely. "Tomura" mocks them by claiming sooner or later they're going to run out of terrain, but Jeanist casually comments they have plenty of material to spare, as new pieces start to emerge from the cracks, stating the arena was specifically designed to defeat him: a coffin in the sky.

Deep within the U.A. fortress, Power Loader, Cementoss, Mei Hatsume, and the Development Class all work hard to constantly repair the pieces destroyed in the battle, with spare parts being created by Creati. Jeanist explains how thanks to his deadly attacks and speed on par with prime All Might, they were able to use his two major battles as a way to counter his abilities.

Mei was the one who came up with idea to make the arena flying, coming up with a way to make use of the evacuation and anti-Decay measures Nezu had set up, as well as dividing the ground into smaller blocks and giving them drone-like properties. And while utilizing Creati, the Development Course, and U.A. staff to circumvent material shortage, they also made use of Chargebolt, Comicman, and the other electricity students at U.A. to power the systems and the electromagnetic barrier, with the former two especially charged up to help their plan succeed.

Best Jeanist declares that it isn't about honor or glory, and the only reason they're there is because they want to protect the days to come, and will put an end to his doom. "Tomura" prepares to attack the arena with a shockwave, however Dynamight mockingly reminds him about what happened in Jaku. Realizing the Quirk isn't working, "Tomura" spots on the electricity generator Phantom Thief, accompanied by Eraser Head and Manual, using Erasure to erase his Quirks once again.

Eraser Head comments how as long as he sticks by Phantom Thief, he can help work around the 5 minute Copy limitation. However, since their plan also involved using One For All to their advantage, Deku being missing doesn't help. Even worse, everyone is caught off guard when "Tomura"'s left hand suddenly begins to transform into a monstrous blob of fingers. Dynamight is unable to explain the nature of the attack to Mirko, with Eraser Head fearing that, unlike last time, "Tomura"'s body is now nearly complete. "Tomura" sends the mass of fingers directly toward Mirko, mocking how much of a letdown Eraser Head turned out to be.

Chapter Notes

 * Dynamight, Suneater, Nejire Chan, Edgeshot, Mirko, and Best Jeanist prepare to face off against "Tomura Shigaraki", even without Deku present.
 * It is revealed the floating U.A. fortress is designed to break off into individual segments in order to combat Decay, as well as being surrounded by an electromagnetic barrier to prevent "Tomura" from escaping.
 * The fortress is maintained by Power Loader, Cementoss, Mei Hatsume, and the Development Course to rebuild the broken pieces.
 * Additional resources is provided by Creati, while the power to sustain the energy and barrier is provided by Chargebolt, Comicman, and the other electricity-based U.A. students.
 * Furthermore, Phantom Thief, assisted by Eraser Head and Manual, Copies Erasure to once again erase "Tomura"'s Quirks.
 * "Tomura" suddenly begins to sprout a monstrous glob of fingers from his left hand, using it to attack the Heroes.