Kokoro and Mitsuru’s Unborn Child

Kokoro and Mitsuru’s unborn child is their fourth and youngest child. It is also the younger sibling of Ai, an unnamed brother, and unnamed sister.

History
During the school entrance ceremony eight years after Hiro and Zero Two’s deaths, it is revealed that Kokoro and Mitsuru are expecting their fourth child. Futoshi later tells Ikuno and Ichigo this during a visit.