平成25年(許)5 (2013 (Kyo) No. 5)
The plaintiff-husband, who transitioned from female to male, and the plaintiff-wife requested the local public agency to amend their family registry to state the plaintiff-husband as the father of their child. The child was born by artificial insemination and had no blood relationship with the plaintiff-husband. The Supreme Court determined that, since the child was conceived by the plaintiff-wife during marriage, he is presumed to be a child of the plaintiff-husband under the Civil Code, and ordered the family registry to be amended.