My Girlfriend's Child manga volume 2 features story and art by Mamoru Aoi.

With her pregnancy all but confirmed, Sachi decides to visit a clinic alone and in secret. She indicates that she plans to have an abortion while filling out all the paperwork, but once she hears the quiet heartbeat of the life forming inside her during the ultrasound, her resolve begins to waver. Now she and Takara have three weeks to decide what to do. But how can they decide the fate of their unborn child when they’re still children themselves? And when will they finally break the news to their parents?