Claire was treated as a failed princess because she didn't follow the education of a proper lady. She was sent on an arranged marriage with an enemy kingdom, expecting to lose her life at any moment. Instead, she was welcomed with open arms and unexpectedly made the fiance of the crown prince. In fact, she had been eagerly awaited as a "living fount of knowledge." She had been treated as a useless person in her homeland, but now she could embark on domestic reforms and started making paper to help her new home. However, some people did not take kindly to this...... Claire tried stop her own poisoning and get out of the situation, but... (Source: Earthstar Luna, translated)

Haruichi, a mysterious boy who can see people's true nature through colors, meets Sayuri, a girl who belongs to the organisation "Kisaragi," which observes youkai escaped to the human realm.

How can I care for a child who lives without sound? Gentaro lost his deaf wife, Naomi, in an accident. A few years later, Yuko, Naomi's beautiful younger sister, died. She died from illness. Yuko was one to keep to herself and thus most did not know she had a daughter. Her name is Shoko. Like Naomi, she is completely deaf. Shoko, with no one to go to, and Gentaro, burdened by his past, end up living together. This awkward pair begin their new life on their small island.

An ecchi comedy about an isekai vampire casually building a harem life. (Source: Kadokawa, translated)