Manabu has been secretly in love with his childhood friend Makoto's mother, Ruka, and one day, on an impulse, he confesses his love for her, only to be rejected. However, his feelings don't go away, they keep coming back ...... In order to calm down, he decides to take a bubble bath with his wife. The first girl they introduce him to is none other than Ruka herself! Embarrassed, she tries to change, but Manabu feels that this is his last chance...