"Never get serious with anyone. No matter what. This is one of the principles I live by." An elite architect meets a tanned manwhore carpenter. Yamashiro is a talented carpenter who has a bad habit of only going after straight virgins over 30. But he also has a strict set of rules to go along with all that sex. While on the job, he meets the mysterious Yashiro, an elite Class 1 architect. Yashiro's first impression of Yamashiro? A complete pervert. And even though they were only supposed to do it once... (Source: Houbunsha)

Principle was published digitally in English as Principles by Houbunsha through Mangaplaza.