"How can they improve so fast?! It took me weeks to learn the timing!!"

— Zushi, referring to Gon and Killua

Promise (約束, Yakusoku) is the 57th chapter of the Hunter × Hunter manga, written and illustrated by Yoshihiro Togashi.


From everyday training, Gon and Killua easily use their Ten and want to catch up to Zushi's level of power, but Zushi asks them to take a rest. As Zushi heads back to his room, Sadaso uses his Nen ability (an "aura arm") to kidnap him, but Killua, out of nowhere, appears and approaches them. He asks them to release Zushi and will set a match to let each of them win, but tells them Gon might break his promise again and will not be able to learn Nen. Agreeing with Killua's conditions, Sadaso, Riehlvelt, and Killua go to the registration booth and register a match together. When leaving, Killua carries an unconscious Zushi and almost threatens the two to keep their promises, while Gido has sent a threat to Gon, using Zushi's shoe, to make him schedule a match.

The next day Killua roams outside and hears a guy selling tickets to Gon and Sadaso's match. Learning the identity of Sadaso, Killua goes directly to Wing and lies by saying he found Zushi asleep outside. Killua asks Wing to show Hisoka and Kastro's match to test his Gyo. Killua is able to detect all the lines attached to the cards and scarf including the hidden line from Hisoka's right arm and able to extract the characteristics of Hisoka's Bungee Gum. Wing congratulates Gon and Killua for learning Gyo in a single night although Gon isn't able to see all Hisoka's abilities.

Wing gives the two permission to pick a date they desire to fight; Killua picks his birthday though it is only a lie and Wing allows them and urges them to practice Ren and Ten before their fight arrives. While walking the two chat about Sadaso and his group. Gon wants to let them win in order to protect Zushi, but Killua has something in mind. The day of Sadaso and Killua's match arrives. Sadaso is seen sitting and talking to himself from his locker room, as Killua out of nowhere threatens Sadaso by pointing a dagger at the back of his head. He tells Sadaso to close his eyes. Killua warns them about breaking their promise, asks him to open his eyes, and threatens them never to use dirty tricks again. After the confrontation, Killua wins by default as Sadaso has withdrawn from the match.

Characters in Order of Appearance


ve Heavens Arena arc
Chapters: 44 | 45 | 46 | 47 | 48 | 49 | 50 | 51 | 52 | 53 | 54 | 55 | 56 | 57 | 58 | 59 | 60 | 61 | 62 | 63
Anime 1999: List of Episodes (1999 series)
Anime 2011: List of Episodes (2011 series)
Community content is available under CC-BY-SA unless otherwise noted.