Shimura Juku was a renowned theatrical group that sponsored famous actors. They held seminars on the 8th floor of an upscale shopping complex where Kenichi Takasuka (protagonist) was studying drama. One day he met a girl loitering outside a seminar on how to overcome stage anxiety.
Her name was Asako Ikemoto (heroine).

They talked for a while. Asako wanted to become an actress. They soon fell in love.

Then.

The "demon director".
He was the famous heavy hitter of Nanpa Productions. He'd grown fat and lost his enthusiasm for film. He loved the casting couch, though.

"My dick is magic," he bragged.
"Women fall on it for a chance in the biz," he snorted.
"They're all cum sluts. Am I wrong?" he belched.
These were his warped views from his powerful position.

He would attend auditions and exploit the hopeful naivete of young girls.

Girls like Asako.

[From DLsite English]