Sandbox / Japanese Publishers

Akita Shoten

• Shonen Champion

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Hitotsubashi GroupHakusensha

• Hana to Yume
• LaLa

Shueisha

• Ribon
• Shonen Jump

Shogakukan

• CoroCoro Comic
• Shonen Sunday

Viz Media

• Viz Media

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Houbunsha

• Comic Fuz
  • IDOL × IDOL STORY!
• Manga Time
  • Love Lab
• Manga Time Kirara

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Ichijinsha (bought by Kodansha)

• Monthly Comic Rex
• Monthly Comic Zero Sum
• Yuri Hime

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Kadokawa

• ENGI (53% ownership)
• Enterbrain
  • RPG Maker
• FromSoftware (69.66% ownership)
• J-Novel Club
• Kadokawa Sneaker Bunko
• Kinema Citrus (31.8% ownership)
• Yen Press (51% ownership)

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Kodansha

• Nakayoshi
• Shōnen Magazine
• Del Rey Manga (de facto predecessor of the current Kodansha US, nobody bothered to move it for some reason)

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Media Factory (bought by Kadokawa)

• Comic Cune
• Dengeki Bunko
• Monthly Comic Alive

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Square Enix

• Monthly Shonen GanGan
• Monthly GFantasy
• GanGan Online
• Young GanGan