ROYD-146 My brother's wife and I were supposed to have a kiss-only relationship...but we couldn't stand each other, we covered each other with saliva, and we secretly had sex over and over again. Mei Itsukaichi

'Mei' was starting to drift away from her husband, who was devoted to work. She begins to develop feelings for me, her brother-in-law who lives in the same house, and a forbidden love gradually blooms between the two... The two make a ``promise to just kiss'' and begin their ninja love. But my desire doesn't stop. As her love and desire intertwine, Mei pours out all her feelings for me, and even though Mei also has feelings for her husband, in the end they passionately love each other.