Kirishima Rino's frequency of visits to Rino's house had increased, as she was the best friend of her son, Kazuya. Kazuya was polite, serious, and well-liked by everyone. Unlike her son, Rino was drawn to Kazuya's kindness and sincerity, treating him warmly as if he were her own child. However, Kazuya had another reason for his visits. From the very beginning, he had fallen head over heels for Rino, captivated by her beauty and figure. His feelings grew deeper each day. Even the smallest words or gestures from Rino sparked impure emotions within Kazuya, and his inner desires gradually became more complicated.