Gitei ni Himitsu ga Arimashite

Shogo and Haruya were perfect strangers before Shogo's mom and Haruya's dad decided to get married. One day, Shogo finds out Haruya's naughty little secret, and ever since, they become "partners in crime"...!! Is Haruya the cool and cocky jerk he seems to be, or is he the dirty and adorable younger man he shows Shogo? A story about family and love revolving around a passionate ex-troublemaker who falls in love with his cute younger stepbrother!