Is Terra Formars Worth Reading? Manga Review & Where to Read

Quick facts
Format	Manga (seinen), 24 volumes
Run	2011–present · ongoing
Community score	AniList 6.9 · MangaUpdates 7.2
Content	Graphic violence and gore, body horror
Where to read	VIZ Media — official

Overview

Terra Formars is a sci-fi horror manga by Yu Sasuga (story) and Kenichi Tachibana (art). Centuries ago, humanity seeded Mars with cockroaches and algae to speed up terraforming. When the first crewed mission finally arrives, the cockroaches have evolved into towering, superhumanly strong, and very hostile humanoids. To fight them, later expeditions are sent in after undergoing the "Bugs Procedure," a surgery that grafts each soldier with the DNA of a different animal, giving them powers to match. It's an ongoing series. This review stays spoiler-free.

What it does well

The premise is the hook, and it's a genuinely strange, memorable one. Giant humanoid cockroaches on Mars could easily be a joke, but Terra Formars plays it dead serious, and the idea of soldiers grafted with insect, animal, and even microbial powers to fight back gives every mission a wide-open toolbox of ways a fight can go. No two soldiers fight the same way, and the story gets real mileage out of matching the right power to the right threat.

Tachibana's art carries the violence well. Fights are fast, ugly, and easy to read even when the panel is full of chaos, and the character designs for both the bug-men and the various augmented soldiers are distinct enough that you can track who's who mid-brawl. When the story wants a scene to hit hard, it hits hard.

The scope also keeps growing in ways that stay interesting. New expeditions bring new questions about where the bugs actually came from and what they're capable of, and the politics back on Earth -- funding, secrecy, and who's really running the program -- add a layer beyond straightforward monster-fighting. Combined with a cast large enough that almost nobody is safe, fights carry real stakes.

Where it falls short

That huge cast cuts both ways. Terra Formars loves introducing a soldier with a full backstory chapter right before killing them off a few chapters later, and after a few expeditions the pattern becomes predictable enough to blunt its impact. It's hard to get attached to anyone when the story keeps replacing its cast.

The international makeup of the crews is a good idea that isn't always well executed -- several non-Japanese characters are written as broad national stereotypes rather than people, which feels dated and undercuts scenes that should land harder. And structurally, the manga has gone on two separate multi-year hiatuses due to the writer's health, most recently resuming in December 2025. That's rough on any ongoing series, but it's especially rough on one this dense with worldbuilding and plot threads -- momentum keeps getting reset just as the story builds up steam.

Verdict

Terra Formars earns points for one of the strangest, most committed premises in gory sci-fi manga, and when it's firing -- a well-matched power against a nightmare enemy, a mission going sideways -- it's genuinely gripping. But the constant character turnover, some ugly stereotyping in the writing, and a release schedule that keeps stalling out make it a harder sell than its core idea deserves. Go in for the bug-men and the body horror, not for a cast you'll get to keep.