Onna no Ko ga Kanzen Naru Ren'ai ni Tokimekanai Mittsu no Riyuu (Volume)

is the first volume of the Onna no Ko ga Kanzen Naru Ren'ai ni Tokimekanai Mittsu no Riyuu light novel series, written by Shinjiro Dobashi and Illustrated by Yukiko Horiguchi. It was released under the Dengeki Bunko Imprint in July 2016.

Synopsis
I will teach you secret love rules that only girls know. Kyoichi Kanzaki, who wanted to use the feelings of love between men and women to obtain enormous interests on campus, was betrayed by his colleagues and was banished from his circle. In fact, this school had "girl's back rules" about romance that boys couldn't see, and boys were secretly rated. In addition, there was even a back group whose livelihood was a love business, and they were in control of their interests! Kanzaki started a new romance consulting business to get up again on campus, but only Yunagi Suzuki, an unreliable girl who tends to dream about romance, came with him !? Love is a business! I will teach you secret love rules that only girls know !! Shinjiro Dobashi, a long-awaited new series that depicts money, desire, and "true love" is now available! If you read this, you are sure to be popular !?

(source: Dengeki Bunko Official Website - Translated)