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From MangaHelpers: A tsukumo-gami is an artifact spirit, which comes into being for very old, and cherished objects. One day, a tsukumo-gami--later named Kyou--is born from an old mirror. Although she remains close to her mirror, she has the physical, movable body of a tiny, dark-haired girl. As she explores the world around her, she makes her first friend, a mouse! Soon her mirror is bought by a girl who can actually see and speak with her, though she professes to have no particular interest in tsukumo-gami. In that way, Kyou and her mouse friend come to their new home, which is a store. Soon she finds another friend in the worker Akane, a girl who can't see her, but who finds her fascinating nonetheless. As Kyou's horizons expand, thanks in a large part to her discovering that she can travel through mirrors, she meets other new spirits and people! [tethysdust]
[taken from fictiondb] THE SEARCH FOR HIS "DREAM HOUSE" ENDED IN THEIR LOVE. Carly Andrews disapproved of the wealthy people who spent their summers in Bar Harbor as they waited for the fall social season to begin but Adam Noble was different. Raised in the community, Adam was a man of wealth and many talents. Lawyer, chef, businessman and a prospective senator, Adam had come full circle. Now he wanted to purchase his dream house and settle down. A partner in Andrews Realty, Carly wanted to get that house for Adam. Soon she realized she wanted to live there with him as well...
From Gaku Gaku Animal Land: [...] in the spirit of different pairing[,] [t]he two girls left behind in the wake of Rei x Ali decide to spend more time together. Well, one of them decides.
Speaking of Mystia, what about an unusual romantic pairing involving her and Alice for a change?
In the *Mako & Aki* series: V.1 - *Oujisama no Yokubou to Himegimi no Yuuwaku* V.2 - *Oujisama no Yabou to Himegimi no Miwaku*
[from fictiondb.com] The Duke of Arkholme, a very handsome and very bored bachelor, organizes a musical Competition to add some spice to his life and satisfy his love for good music. But much to the Duke's chagrin, the Competition falls flat ... until he is awakened one night by beautiful music from his own piano, played by an equally beautiful young woman. From that moment on, boredom is banished from the Duke's life as he pursues the mysterious Vanola across England to win her heart.