Shonengahosha

Shōnen Gahōsha (株式会社少年画報社, Kabushiki-gaisha Shōnen Gahōsha) is a Japanese publisher named for Shōnen Gahō ("Boy's Illustrated News Magazine"), one of its first magazines.

From the Wikipedia article “Shōnen Gahōsha”, licensed under CC BY-SA 4.0.

Daitosha, YK Comics, Young King Comics.

Large trade publishers generally accept manuscripts only through literary agents, while many independent and small presses accept direct submissions during reading periods. Before submitting anywhere, read the publisher's current guidelines, study recent books on its list, and never pay a reading or publishing fee to a traditional publisher.