Ai to Ao no Kyoukai

Uozumi Aiko works at a bookstore and is 29 years old with no spouse. Her family urges her to marry, but she continues to live according to her own schedule. One day at work, she is startled by a young man who is later revealed to be her cousin. It is also announced that they will begin living together. The narrative follows the experiences of this woman and her cousin as they navigate life together.