Hyakuni: Kazokutte nandarou ne

Two lonely sisters and a mysterious creature. They begin a family life that is kept secret from the adults. One day, two sisters abandoned by their family meet "102-chan" and "Zero-san," two people with mysterious powers. Though they are afraid of them, as they live together, the sisters experience the warmth of family for the first time. But one day, their existence is on the verge of being discovered by the townspeople. "The humans who abandoned them" or "a different species that acts like family." What will the sisters choose...? This heart-wrenching story asks the question, "What is a true family?" Illustrated entirely in color by up-and-coming manga artist ISHIDAUMI. Includes over 40 pages of original illustrations!

(Source: Kadokawa, translated)

Note: Originally self-published on Twitter and Pixiv, was then licensed by Kadokawa for commercial release.