Tosaya, Kou

A man working at a soul-crushing corporation discovers he's trapped in a time loop at his office and he's the only one who knows it! A one-shot manga about corporate hell and time paradox.

(Source: MANGA Plus)

Oshigoto wa Owaranai!

Work Never Ends!

お仕事は終わらない!

Kameyama, Youhei

Kouya, Don

Arrested for reckless space driving, super human Chiharu and cyborg Makina are sentenced to clean the Milky☆Subway—an old interplanetary train.

Easy enough, right? Wrong. When the train suddenly takes off, they are thrown into a high-speed space-train spectacle packed with chaos, no plans, and zero strategy.

Just pure momentum!

(Source: Anime official website, translated)

Ginga Tokkyuu Milky☆Subway

Milky☆Subway: The Galactic Limited Express

銀河特急 ミルキー☆サブウェイ

Yachi, Taiyou

Half a century ago, the Cosmic Demon Delekacon was sealed away, averting Earth's destruction! And now, Pec—the demon's left eye known as Eye Boy—is living it up as a permanent freeloader with his best friend Keigo?! A groundbreaking 79-page one-shot mixing youth, sci-fi, and friendship!

(Source: MANGA Plus)

Eye Boy

アイボーイ

Hako, Isse

A white, round SOMETHING has appeared in the Sea of Japan! The notoriously lazy Harusame gets appointed as the mysterious marine creature "Shiromaru" handler along with two quirky companions! While Harusame wants nothing more than to avoid human interaction, his encounters with Shiromaru force him to confront the past... A coming-of-age sci-fi drama for anyone who finds this world hard to live in!

(Source: MANGA Plus)

Shiromaru

しろまる

Andou, Kouhei

Mabuchi, Asako

Rio Mikazuki is a shinobi. That is, a shinobi living in the modern worldーa "shinewbi" of sorts. All of the ninjutsu and ninja tools of the current era are at her immediate disposal and are considerably more high-tech than before. However, it seems as though her senior partner, Igarashi, has learned how to use real ninjutsu through the long-forgotten traditional training methods of the old shinobi... The stage unfolds for a romantic comedy of two shinobi working in a modern world!

(Source: MANGA Plus)

Imanin

Shinewbi

イマニン

Watanabe, Kizuku

Join the top troops of the Third Division of the Japan Defense Force, a military organization tasked with the neutralization of kaiju, on their days off! Kafka Hibino attempts to bare his soul in meditation, only to end up baring something else. Then, an off-duty Captain Mina Ashiro blows off steam at the arcade, Reno Ichikawa confronts his fear of ghosts, a curious cadet sets out to glimpse Vice-Captain Hoshina's eyes and uncovers a sweet surprise, and Kikoru Shinomiya finally spends time with her friends.

(Source: VIZ Media)

Kaijuu 8-gou: Relax

Kaiju No. 8: Relax

怪獣8号 RELAX

Yamagishi, Sai

Heji, Teito

Indifferent student Takatsugi-kun is living an uneventful life, until he meets Niina, a girl who's utterly obsessed with baseball. Though she seems to have nothing but baseball on her mind, Takatsugi finds himself drawn to her. Their relationship progresses smoothly...or does it? An unconventional triple-threat romantic comedy begins!

(Source: MANGA Plus)

Yakyuu Bunmei Alien

Aliens, Baseball, and Civilization

野球・文明・エイリアン

Meet Linear Seven, an alien observer of other alien life forms. When news breaks that Earth is doomed to extinction, she makes her decision: "It's now or never!" And so begins her journey to Earth...

(Source: MANGA Plus)

Linear Seven

リニアセブン

Hasegawa, Yuuichi

Parodic retelling of the events of the Kidou Senshi Crossbone Gundam: Kami no Kaminari Keikaku no Shinjitsu from the perspective of one of that manga's side characters.

Kidou Senshi Crossbone Gundam: Kami no Kaminari Keikaku no Shinjitsu

Mobile Suit Crossbone Gundam: The Truth of the "Thunderbolt of Zeus" Project

機動戦士クロスボーン・ガンダム 神の雷計画の真実

Sengi, Chiki

When Tokyo is attacked by evil monsters, who better to save the day than the Super-Ultra-Mega-Level-Anti-Monster-Specialized-human-Final-Boss-Weapon OSAMU!!!

(Source: MangaDex)

Osamu

OSAMU

Nakamura, Kanko

On the day of her high school entrance ceremony, ordinary high school girl Akari receives a marriage license application from the strikingly beautiful Runa Kiyozumi. Akari is bowled over in shock, and that's before Runa shows up at her house! A torrential downpour means Runa can't go home, which means one thing: time for a sleepover! Add Mochi, Akari's stuffed animal and imaginary friend who loves to ship people, into the mix, and things are sure to get even more complicated!

(Source: Seven Seas Entertainment)

12 Manga Like Ohitorisama no Nanai-san