Hybrid Child

Hybrid Child is a one-shot Japanese manga written and illustrated by Shungiku Nakamura; the creator of Junjou Romantica. It is licensed in North America by Digital Manga Publishing, which released the manga through its imprint, June, on August 16, 2006. A drama CD was released by Marine Entertainment in 2005. An OVA adaptation of the manga was announced as being in development in 2011.

Plot
The Hybrid Child is an amazing android that can grow if it is lavished with enough love and care from its owner. Neither fully machine nor fully human, the various Hybrid Child models develop strong emotional bonds with their owners. This series contains several short stories of love, sacrifice, and drama: Young Kotarou learns the importance of responsibility when his Hybrid Child's lifespan runs out. The tragic swordsman Seya learns to love again with the help of his Hybrid child, Yuzu. The final tale tells the story of Kuroda, the creator of the Hybrid Child designs, and how his lost love inspired their creation.

Official
http://hybridchild.jp/