就是这个动画，异地恋看了都哭惨 (2014)

Faith of Distance

If the two conditions of self-control are long and long, they will linger in the pilgrimage. Because of the pains of parting Acacia, they will know more about cherishing the lifelong observance of the future. Whether you have experienced a strange land relationship, or are about to start, are still sticking to it, or you have already regretted it, or have a successful outcome, the “Faith of Distance” animation is for you!