Yui, who had completely trusted Tomoya, her daughter's boyfriend who had come to play at home many times. Yui, who liked Tomoya, who actively helped with housework and was considerate, had high hopes for her daughter's future. However, those expectations were trampled by Tomoya's own hands. 'Before I knew it, I had fallen in love with you, Mom!' Tomoya attacks Yui, who is bewildered by the shocking words. A piece of pleasure begins to be born in the midst of turmoil...