Wombs.

Wombs (stylized in all caps) is a Japanese manga series written and illustrated by Yumiko Shirai. It was serialized in Shogakukan's seinen manga magazine Monthly Ikki from April 2009 to October 2010 and later directly published via tankōbon volumes, with the fifth and last one released in January 2016. In 2016, Wombs won the Grand Prize of the 37th Nihon SF Taisho Award.