So... is Megaton-kyuu Musashi finished or not?
NO, it is not finished.
Why?
MangaUpdates contains information about the anime adaptation and indicates that it is incomplete.
Watching Order (by release date)
Here you have all the anime relations we detected ordered by release date, so you can see the reason for this status in context and also use it as watching order.
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Megaton-kyuu Musashi
Megaton Musashi
Anime - Base
Release date: October 01, 2021
Megaton-kyuu Musashi 2nd Season
Megaton Musashi Season 2
Anime - Sequel
Release date: October 07, 2022
Synopsis
Megaton-kyuu Musashi tells the story of humanity's near extinction at the hands of alien invaders known as the Dracters. Earth has been ravaged, and the surviving humans are forced to live hidden in shelters.
The people of Ixia live a seemingly normal life, unaware of the planet's true state and their lost past. Their memories of the invasion have been erased.
However, a select few, chosen to become pilots, are tasked with piloting massive robots called Rogues to fight back against the alien threat. A new pilot is about to be chosen, marking a turning point in the hidden war for humanity's survival.