A custodian's accidental transformation into the formidable demon Janemba disrupts the afterlife, prompting Gokuu Son to confront this new threat. As Gokuu and his ally Pikkon engage in a battle against Janemba's initial form, they soon face a more menacing transformation. Janemba evolves into a sword-wielding adversary of unmatched strength, challenging Gokuu like never before. With Vegeta's spectral assistance, Gokuu endeavors to prevent Janemba from unleashing chaos on the universe's delicate balance.