Supreme Hero Arc

The Supreme Hero Arc is the nineteenth arc of the series.

Plot
Saitama encounters Rangor, one of the nine warriors of the dragon alliance, and defeats him with a single punch believing it to be a robbery. He then comes across a group of people wearing plate armour calling themselves the Saints. They explain how by defeating Rangor, Saitama has protected the Cruel Dragon seal and saved the world, and then tell the legend of a dragon that descended upon Earth taking countless lives and scorching the land, earning it the name of "The Cruel Dragon". Afterwards they go on to talk about how ancient warriors managed to weaken the dragon with costly sacrifices, allowing seal masters to seal away the essence of the dragon away in nine seperate seal stones scattered in temples across the land. This brought rise to two groups: the protectors of the seal stones, the Saints, and a group believing themselves to be dragonborn hoping to ressurect the dragon, an organization called Deathbone. The two groups have had conflict for 800 years, however recently Deathbone increased their activity, taking advantage of the frequent monster incidents as of late. Revealing that they were ambushed while moving to a new protection location, and that Saitama had saved them. We then see one of the Saints holding down a member of Deathbone that begins to monologue, slowly losing consciousness, until Saitama throws a bucket of water on his face to continue inquiring about the resurrection. Saitama eventually comes to the resolve that if the dragon is going to resurrect at some point, they might as well do it now and defeat it, which he claimed that he would help with. Much to the Saints' dismay, Saitama picks up the Deathbone member and flees from the Saint members chasing after him, who helps him locate all the nine seals. After the Deathbone member conducts the ceremony, the Cruel Dragon is resurrected and Saitama defeats it in one punch. At the end, we see Saitama contemplating over the event in a store as he is picking out some groceries.

Later that night, Saitama meets up with Genos on a street leading towards Former A-City. Genos is visibly damaged and explains that it is from a battle against a powerful demon level monster when Saitama asks, and requests another spar with Saitama. He then mentions that Kuseno has shown great interest in Saitama's physical abilities and wishes to collect his data. Saitama asks Genos what he bought and Genos lists the items, adding the fact that he got them for cheap. Saitama is impressed by this and compliments him by telling him that he's mastered the trick to buying stuff, even admitting to missing out on some AAA batteries at half price. Suddenly, the two encounter Sweet Mask who offers to meet up for a cup of tea tomorrow noon as he wants to discuss something in person. Genos refuses the offer, believing that Sweet Mask is talking to him, but it is then revealed that he was speaking to Saitama.

The next day, Saitama and Sweet Mask are sat on a table in a Cafe. A waiter approaches them and asks what they would like, Saitama orders a coke and Sweet Mask orders a lemonade, but orders a shisho ginger ale on his behalf instead of the coke.

Story Impact

 * Sweet Mask reveals his past to Saitama