Kuro Kyoudai no Mata to Miko

An office worker's older brother, Mata, and a non-human sister, Miko. It's a daily life that goes around loosely between the brother and the sister who don't have blood.

Original Web Manga

*Note:

• The manga is published as a oneshot for 494th Monthly Newcomer Manga Award. The continuation of the story is available on Days Neo for free.
• "Mata" (Ma-ta) and "Miko" (Mi-ko) is the correct reading according to the author, which can be seen in the cover. It could be Marta and Miiko.*