In order to benefit their families, Koyuki (age 16) was wed to Shin (age 37). Despite the large age gap, both are exceedingly inexperienced in the matters of love, so they never quite know how to act around each other. To make matters worse, Shin is forbidden from being physically involved with Koyuki until she turns 20. In this environment, how will they form a proper husband-wife relationship?

Married off to a man more than twenty years her senior, Koyuki has no idea what her new life has in store for her. She's so in the dark, in fact, that she hasn't even seen her husband's face! But Koyuki isn't alone in fumbling through the intricacies of wedded bliss. Mask-donning Shin might have many years on his young wife, but as it turns out, he's just as naïve as she is! Will this pair of innocents ever get past their awkwardness (and the age gap)?!