Nenene

In order 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?