Story by: Akira Toriyama | Art by: Toyotarou
Volume 3 of DRAGON BALL SUPER ended with a defeated Goku and Vegeta returning to the present day, with Trunks left behind in his future to hold off Goku Black. As volume 4 opens, Goku and Vegeta arrive and Bulma quickly explains the facts of interdimensional time travel in the DRAGON BALL world: since Trunks' time machine is "tied" to a parallel future, it is unable to return to the exact moment it left. However long passes in the present while the machine is refueled will also pass for Trunks in his time -- and it'll take a full day for Bulma to charge the machine up again.
Vegeta spends the day training in the Room of Spirit and Time (a.k.a. the "Hyperbolic Time Chamber" in FUNimatin's TV dubs -- a name I've never liked since it makes the place sound more scientific than magical), while Goku goes to Master Roshi to learn the Mafuba technique, an ability Roshi used many years ago against the Demon King Piccolo. Basically Mafuba will seal any evil being away, so long as the proper kanji is somehow applied to whatever vessel the villain is forced into. Since future Zamas is immortal, Goku realizes Mafuba may be the only chance to beat him.
(By the way, I love the callback to the Mafuba technique (known as the "Evil Containment Wave" via FUNimation) -- as I've mentioned before, original DRAGON BALL is my favorite part of the entire DB/Z story, so anything that references it this directly is A-okay by me.)




