Imada, Yuuki

Shadow the Hedgehog, a failed wonder drug meant to cure Maria, struggles to find the meaning to his life. When the Earth National Defense raided the Space Colony ARK, they aimed to dispose of everything, including Maria and Shadow.

After Maria's tragic demise, Shadow is sent to a mysterious dimension known as White Space, in which he meets a mysterious one-eyed creature. The creature promises that Maria can be brought back to life as long as Shadow finds the Three Wishing Orbs.

(Source: Sonic Wiki Zone)

Shikkoku no Harinezumi: Shadow the Hedgehog

漆黒のハリネズミ シャドウ・ザ・ヘッジホッグ

Nagayama, Yoshitaka

After defeating Dark King Demigra, Goku, and his allies go to visit the Planet of the Kaio, only to find that Kaio North and co. are nowhere to be seen... While our heroes are trying to figure out what could have happened, a mysterious new foe appears!

(Source: MangaDex)

Super Dragon Ball Heroes: Meteor Mission!

スーパードラゴンボールヒーローズ メテオミッション!

Yoruno, Hitsujigumo

Agarizaki, Yuiko

A spaceship in the shape of a horse-drawn carriage travels across the galaxy. Riding in the carriage is Ridley, the scientist who built this eccentric spaceship, and her partner Watari, a shy girl. The two leave Earth, which has become uninhabitable due to environmental pollution, and set off in the carriage. Their goal is to find a safe planet to settle.

However, all the planets they visit are very strange! A planet with a god who can bring all things back to life, another planet where the luckiest people are considered the greatest, and a planet with countless libraries... The two girls are sometimes thrown for a loop by these strange worlds...

(Source: Kadokawa, translated)

Shoujo Seikan Hyouryuuki

Girl's Interstellar Adventure

少女星間漂流記

Unreal

After global warming destroyed the Earth, humanity set off for the uncharted planet paradise known as "Arcadia." Crew member Yeongsu Dong wakes up from stasis to find himself the lone survivor, orbitting the planet in the debris field of the wrecked ship. He gets to the surface, where he is immediately attacked by wild creatures, and gets caught in the civil war among the native Arcadians. He must learn to communicate and survive in this strange new world, and find a way to stop an apocalyptic comet set to destroy his new home.

(Source: Webtoon Entertainment)

Grand Finale

그랜드 피날레

Meeb

Ogino, Yuhey

Since his mother collapsed, Ryuji Hashiba, a high school student, has had to give up his dreams and work to earn the money to pay her hospital expenses. One day, Ryuji finds an unbelievably lucrative part-time job, and even though he knows it's shady, he participates in order to pursue his dreams again. When he follows his employer's instructions and passes through a mysterious door, an unknown world stretches out before him, and he is suddenly attacked by monsters...!?

(Source: Kadokawa, translated)

Yami Baito-saki wa Isekai deshita

闇バイト先は異世界でした

Hidaka, Tatsuya

It's been a thousand years since the world was covered in a sea of ​​sand. The former scientific civilization has perished, and the surviving humans are in a harsh struggle for survival against giant water-stealing creatures known as "mizuhami" (water eaters). One day, Noah, a boy who lives in a remote sea area, saves a woman who is being chased by mizuhami, but she turns out to be an incarnation of "Hinokami" (the god of fire), who has the power to burn anything she touches...!? A boy and a girl travel in search of the paradise at the end of the sand sea. A super-classical desert punk fantasy!!!

(Source: Mag Garden, translated)

Suna no Umi no Ifrit

"Sand Rat" and "Princess of Blaze"

砂の海のイフリート

Yamaji, Arata

Hoshikuigoroshi no Egnaro

Hoshikui Killer Egnaro

星喰い殺しのイグナロ

Petoka

Tenchi Mission

天地ミッション

Kurata, Hideyuki

Antenna Gyuugyo

A time when humanity left Earth and migrated to other planets in the galaxy. Mads, a Martian whose life is threatened by the mafia, and Viine, a Venusian who is the galaxy's greatest diva, are two unrelated people who meet due to a mysterious "orb" that fell from space. They are unaware that it is a sign of a major event that will shake the solar system. This is the beginning of a thrilling and entertaining sci-fi manga with a last-century view of the universe!

(Source: Kadokawa, translated)

Nomads

NOMADS ノーマッズ

Oosaki, Takahito

A shelterpunk sci-fi story depicting the terminus of humanity which fled underground!

(Source: Shinchosha, translated)

Nenokuni no Musubi no Miko

ネノ國の結ビノ巫女

Hishida, Sumi

Menkyo Toru nara Automatic de Ii yo

免許取るならオートマでいいよ

Yutakame

The self-proclaimed Wilderness Jenny is a nature conservation officer in charge of terrestrial regeneration. One day, she picks up Flora, a girl with amnesia who was in a capsule that flew from the sky. Together with Flora, Jenny goes on a journey to revive the earth while solving problems in cities filled with thugs and monsters. Jenny, a conservation officer, and Flora, a mysterious girl, explore a western-style far-future world!

(Source: Takeshobo, translated)

Akeboshi no Jenny

Jenny of the Morning Star

明星のジェニィ

6-okunen no Hakubutsu Tabi

12 Manga Like 6-okunen no Hakubutsu Tabi