Operation Han-Gyaku-Sei Million Arthur

The story centers around the legends of Excalibur, a sacred sword with the power to bestow extraordinary strength on its wielder and grant them the title of Arthur. However, due to a divine miracle, multiple Excaliburs were created, disrupting the timeline. A group of six Arthurs, including Danchou, Renkin, Kakka, Yamaneko, Tekken, and Rurou, are sent back in time to eliminate the abnormal Excaliburs, a total of one million swords. Their mission is to restore the original timeline.