His father remarried Mako, a former subordinate at the company who was much older than him, and she suddenly came to the house as Yusaku's stepmother. Yusaku, the son, could not accept such a young Mako as his stepmother. One day, when a friend came to visit, Yusaku bragged and told her that Mako had come to the house for his money, and he ended up raping her. After that, Yusaku became aware of Mako and even looked into the bedroom where she shared with her father. However, Mako noticed his gaze and began to feel something as she gazed at Yusaku...