Kazusa fell in love with the kind and warm-hearted Maruyama, and they began dating. However, one day his true identity was revealed—he was actually a father with two sons. Shaken by the shock, Kazusa worried whether he could accept her as a mother figure. Amidst this turmoil, a hidden relationship between her and Maruyama came to light, and an unexpected incident brought the three of them closer than ever. This secret was a forbidden love—something she couldn't tell her husband, a truth buried deep within her heart.