Hello, good-bye

Synopsis

In Japan, there are two conflicting factions, The United Provinces of Japan (日本合州国) in the west and The Federation of Japan (日本連邦) in the east. Despite them still opposing each other, they have made a temporary suspension of fighting known as The Morino Ceasefire Treaty (守乃特別区). This treaty has existed for at least a century and many have decided to worship it. The story is set at the Cathedral School (天主堂学院), a catholic school located on an island that provides education from kindergarten to university. Sister Therese teaches history there.