A Triangular Love Affair is a series written by Yamasaki Masato and drawn by Yanagawa Rio which tells of an unusual love affair between Akira and his lovely stepmother Chisato. The love affair begins after the death of Akira's father and continues in secret. But what the two lovers don't know is that Chisato's daughter and Akira's stepsister Mai has seen them together which brings up feelings in the young lady who herself keeps secrets of her own from her stepbrother and mother. Secrets and forbidden love abounds until a climactic final chapter when all secrets are brought to light...