Saitama

Genos opens on Mosquito Girl with a blast, but she slips it, dives in to rip off his arm, and flies away carrying it. Mid-flight she realizes her legs are gone below the knee, glancing down to see Genos flinging them aside. She scatters mosquitoes at him to buy distance, then summons the whole swarm to feed her their blood. As Genos moves to strike the cloud, a shout draws his attention to Saitama running into the street, and he warns the newcomer to take cover or die. The swarm descends on both of them, and Genos incinerates every insect in a huge fireball. Certain the blast killed the bystander, he is stunned to find Saitama standing untouched, though completely stripped of his clothes.

Strengthened by the fresh blood, Mosquito Girl tears into Genos, nearly splitting his chest. His counter-punch misses, and she dismantles him without mercy, severing both legs and cutting his torso apart. Falling and out of options, Genos resolves to self-destruct and take her with him. Before he can, Saitama slaps Mosquito Girl across the face, launching her through a building and far into the distance, then offhandedly mentions that he hates mosquitoes. Genos asks his name and requests to become his disciple.

Mosquito Girl dismembers Genos and empowers herself by draining her swarm. Genos wipes out the mosquitoes in an explosion that leaves the newly arrived Saitama unharmed but naked. As Genos prepares a suicidal self-destruction, Saitama ends the fight with a single dismissive slap that sends Mosquito Girl flying, prompting Genos to ask his name and pledge himself as a student.

Mosquito Girl appears on the online cover. This is the first chapter in the series to take its title from a character. It belongs to Volume 1 within the House of Evolution Arc and was adapted as part of Episode 2.