Read Sci-Fi Manga Online
Celestial Chronicle Shion

Monsters
Occult
Space
Supernatural
Shion is the captain of a space battleship and has a rare ability to control it with her mind, giving humans a small advantage against the draconic aliens who are trying to invade Earth. Her brother, Senri, works as the navigator and becomes suspicious as he finds evidence of a traitor, but the reality is far more fearsome than anything they could have imagined.
Am I Actually the Strongest?

Isekai
Being reincarnated into another world with the promise of a “cheat” power is one thing, but being reborn as a baby, and then left for dead after your royal parents think you’re powerless? That’s another thing entirely! Now the newly born Reinhardt—Haruto to his new friends—must find his way through a dangerous world...but luckily he’s got magic that’s quite literally off the...
Firehounds

Cyberpunk
Gore
Humor
Mystery
Science
A decade after a global catastrophe known as The Blackout, United Earth Government summons a medically discharged soldier, Zedd, back into action. Tasked with reaching out and helping fractured civilizations fight off growing underworld influences, he realizes that his past is deeply connected to The Blackout.
Cells at Work!

Gore
Strep throat! Hay fever! Influenza! The world is a dangerous place for a red blood cell just trying to get her deliveries finished. Fortunately, she's not alone...she's got a whole human body's worth of cells ready to help out! The mysterious white blood cell, the buff and brash killer T cell, the nerdy neuron, even the cute little platelets—everyone's got to come together if they want to keep...
Remnants of Angels

Cyberpunk
Dystopian
Monsters
Post-apocalyptic
Supernatural
In 2054, mankind has plunged the Earth into chaos and is on the brink of environmental collapse. One day, a strange object appears from the sky, crashing and releasing a gas that turns people into ravaging monsters with the one goal of killing humans. After witnessing her life crumble apart before her eyes, 16 year old Cyrus, along with her remaining friends must do what they can to survive, not...
Inuyashiki

Family
Ichiro Inuyashiki is down on his luck. While only 58 years old, his geriatric looks often have him written off as a pathetic old man by the world around him and he’s constantly ignored and disrespected by his family despite all that he’s done to support them. On top of everything else, his doctor has revealed that he has cancer and it appears that he has little time left in this world. But...
Scath

Robots
Science
Space
The Earth destroyed by a nuclear accident now uninhabited. The frontier of space open for exploration. An Empire ruling the world and stymulating the growth of civilization. But now a strange signal has been discoverd from an unknown planet. Will it be something that can change the fate of our homeworld? Or will it bring imposing doom?
Galaracers

Aliens
BIPOC
Cyberpunk
Fighting
Gangs
Space
Humanity's first urge to explore space came with the birth of a Galactic Empire hellbent on finding magical items. In exchange for their lives residents from other planets searched for these items to give to the empire. Fast forward 1000's of years later and everyone wants to be a Galactic Scavenger! When a group of young scavengers band together to pursue their dreams they begin to uncover the...
Midnight Call

Anthropomorphic
Cyberpunk
Dystopian
Fighting
Humor
Love
In 2290's life is not easy as a Beastian living on earth. Tensions between humans and other species are at an all time high, and only getting higher. Yet everyone still tries to live their lives normally, or at least as close to that as possible.
Tree of Life x

Political
Robots
Space
In the distant future, where humanity has conquered the stars and colonized space, a young office lady is trapped in the endless monotony of daily life. But that all changes after she’s randomly selected to be sacrificed in a secret government experiment. Now wanted by her own government, Aida Ezumi is forced to wander the galaxy to try and escape death. But she won’t be able to run forever...
RISING STAR

Cyberpunk
Dystopian
Mecha
Military
Post-apocalyptic
Robots
A sci-fi ensemble drama set in a post-apocalyptic world.
This manga is currently in Japanese only
Granblue Fantasy

Video games
The manga based on the acclaimed RPG, from the designers of gaming classics Final Fantasy V/VI/IX. Don’t wait for Granblue Fantasy: Relink to return to the world of Granblue!Ever since his father left home, Gran has longed to search for Estalucia, the mystical island in the sky. Gran’s adventure begins when he runs into Lyria, a mysterious girl being chased by the Imperial Army. Even though...