Saitama vs. Tatsumaki

Do it outside!'''

Saitama vs. Tatsumaki is the battle between Saitama and Tatsumaki, the second highest-ranking S-Class hero.

Prelude
In the underground of A-City Headquarters, after preventing Psykos from being abducted by Apollo, a member of Tsukuyomi, Tatsumaki decides to make Fubuki cut ties with the Blizzard Group. As she is about to punish members of the group in order to make sure that they will not bother Fubuki anymore, Tatsumaki is stopped by Saitama, who jumps in and tightly catches her hand.

Battle
Having been suddenly stopped by Saitama, Tatsumaki is frustrated and tells him to let go of her. When Saitama does not do so and instead asks her to calm down, Tatsumaki attempts to send him flying with her telekinesis, although Saitama resists the ability before remarking that her power is not much different from Fubuki's. Provoked, Tatsumaki increases her psychic output in an attempt to get Saitama off her, which blasts through the wall behind him, causing great destruction. However, Tatsumaki is surprised to see that Saitama is withstanding her power, with him simply uttering that his muscles are twitching on their own. She then recognises Saitama as the one who was with Genos whilst Saitama tells Fubuki to escort the others to safety. Fubuki conforms to Saitama's request which prompts the elder sister to ask about their relationship. Saitama replies that he is merely an acquaintance before Tatsumaki proclaims she will find out soon enough if Saitama is worthy of hanging over Fubuki. The surroundings begin twisting due to Tatsumaki's psychic power and in response to this, Saitama tightly grasps her and by forcefully jumping, shoots himself out of the place and heads outside, taking Tatsumaki with him.

The two of them crash onto the ground, two kilometers to the northwest from the Hero Association HQ. Tatsumaki tries to get Saitama off her by rolling him many times, although to no avail as he still tightly grasps her hand. The female esper accuses Saitama of being a pervert for persistently sticking with her, which Saitama denies, simply saying he does not want her to run away and go around destroying houses again.