The story
Ohta Publishing was created in 1985, when it separated from the publishing department of Ohta Production, a talent agency specializing in stand-up comedians. (Founded as a yūgen-gaisha, it has, as of 2013, been converted to a kabushiki gaisha.)
Initially, from an outside perspective, Ohta Publishing did not seem like a serious company but rather a sort of toy company of Takeshi Kitano (who was an Ohta Production artist back then). It released books that were of interest to Kitano himself.
In 1989, Ohta published the famous book The Age of M about serial child murderer Tsutomu Miyazaki and started establishing itself like a source of provocative "subculture" items. Around the same time, the bi-monthly magazine QuickJapan was founded. In 1993 Ohta released the book The Complete Manual of Suicide and in 1999 Battle Royale, which shook Japanese society.
At the end of the 1990s, the company also started working with manga artist Naoki Yamamoto, dubbed the master of erotics, and founded the manga magazine Manga Erotics. Its successor Manga Erotics F now accounts for a large percentage of all company's manga sales.
From Wikipedia’s article on Ohta Publishing, shared under CC BY-SA 4.0.4
