After losing her husband, Kyoko runs a small izakaya alone, haunted by the unforgettable pleasure she felt when she took the virginity of her late husband's younger brother, Kazuto, before leaving the family home. Meanwhile, Wakana, Kazuto's former high school teacher, had secretly been in love with him when he was her student. After Kazuto graduated, their relationship turned romantic, and despite opposition, they eloped. Now, these three individuals—bound by complex desires and past secrets—begin an unconventional cohabitation.