I Love You Just a Little Bit

Story :  "I'm sure I'll have to pay for this one day." When Mitsu was a junior high school student, a fortuneteller told her, "You should marry the person you love the second most." Now all grown up, she works at a clinic. One fateful night she runs into her first love, Arishima, and they start having an intimate relationship. But Mitsu is already married to a man who is a wonderful and kind husband?! Mitsu and her husband, Arishima and his wife. Four point of views, two married lives, only one way this can end... right?