Spoiler Summary [Click to show or hide]:
OPM Manga Chapter 37.5 is a calm chapter where no monster activity happens.
But the intro shows Saitama discovering a rock in his boots and, together with Genos, plans to sell it at a high price. Claiming it’s from the moon, they head to a pawnshop, but Saitama loses the rock, and they look for it the whole night.
Meanwhile, the old Hero Association headquarters stands in ruins, and directors engage in meetings. One director proposes removing the rubble within ten years, sparking debates among them.
As they discuss, panic ensues when they sense an earthquake, fearing another alien attack.
A colossal robot resembling an AT-AT Walker from Star Wars appears, causing further panic among the directors. They urgently call on Tank-top Master to deal with the threat.
Tank-top Master, along with other heroes, confronts the enormous robot. He powers up and, with incredible strength, stops the robot’s foot with his bare hands.
However, smaller robots with round bodies and helicopter rotors emerge, attacking the heroes.
Suddenly, the smaller robots ignore the heroes and start consuming the rubble. It’s revealed that these robots are from Metal Knight, aiming to reconstruct the city in ten days or less.
In the end, the new Hero Association Headquarters is established, and debris is cleared while roads are built in just seven days.
