Boku no Dokusaisha

The main character, Haruka is the only son of a company owner. He had a perfect life, till both of his parents die in a plane accident and his company has a takeover. The one who was behind the takeover is his old friend, Masaki. Masaki had disappeared while they were in college and now that he is back and in control of the company, his behaviour is totally different. Haruka is forced to work under the cruel tyrant he once called his best friend.....

[From YaoiOtaku]