The only way the key can be wound is by Zennosuke doing good deeds and if he does enough of them, he will be released from his servitude to the god. In order to achieve this end, he is given the Dango-ken, which is a sword with Japanese Dumplings skewered onto it. Whenever Zenmai Zamurai sees people doing injustice or generally being out of control, he uses his sword to shoot the dumplings into their mouths.