Unlike standard romance manga, it focuses on the power struggle and the mental games played to avoid "losing" the cohabitation challenge.

At the heart of the series is the ongoing "battle" between the two leads. They frequently engage in sexual tension-filled challenges where the first person to show genuine arousal or emotional vulnerability "loses". This dynamic serves as a metaphor for the fear of vulnerability in modern relationships. By turning intimacy into a competition, the characters attempt to maintain control in a situation where they are fundamentally vulnerable—one due to financial instability and the other due to emotional isolation. Tsundere Archetypes and Subversion

The story follows , an aspiring real estate agent, and Michiru , a beautiful girl with no place to live. They enter a unique living arrangement: Michiru can stay in Aikawa's apartment for free as long as she can make him "lose" a specific physical challenge. Genre: Seinen, Ecchi, Comedy, Romance.