(from ebookjapan):

The legendary Ultra Comics in 4 volumes! The long-awaited reprint in e-book format, featuring an epic full-length original story and a series of short stories based on the TV series! The popular hero manga that is well-known on TV is now available as a bunkoban.

The monster that each of them struggled with the most comes back to life (?!), Ultraman, the returning Ultraman, and Taro are defeated one after another. And even Ace is in the clutches of the enemy. ...Zoffy and the other Defense Force members are saddened. Just then, a mysterious light comes from the moon!

Zoffy and his team rush to the moon and find the Space Demon King Jackal there. It turns out that this Jackal is the one who transformed into a monster and buried the Ultra Brothers! The battle begins, but Zoffy and his team are no match for a foe so powerful that he once challenged the Ultra King. In desperation, they flee back to The Ultra Star, but...!

(from "Jackal vs. Ultra Brothers") and one other episode. The Jackal vs. the Ultra Brothers Episode 1: The Formless and Formidable Enemy The Ultra Star ▼ Jackal vs. Ultra Brothers Episode 3 / A Mysterious Super-Human Appears! Jackal vs. Ultra Brothers Episode 4 / Resurrection! Ultra Brothers ▼ The Challenge of the Young Fighters

[Warning]. Some parts may be difficult to read depending on the device you are using. We recommend that you check the standing file on your device. Fixed EPUB 73.2MB (value at the time of proofreading data)