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In some Asian countries - it is not possible to have same sex marriage. So the compromise that people use is to "adopt them" because in the Asian culture being family is the key to marriage.
Since you are adopted, you are now family and thus have "created" a marriage. It is a very common cultural/literature theme :)
Why adoption paper and not marriage.... I mean if arikawa's mom adopt misaki then willn't they become brothers or maybe not...... I am confused