When a teenage girl unexpectedly claims to be his daughter, Tenchi Masaki is bewildered. Bringing her home to unravel the mystery, he faces chaos as the Masaki household grapples with this revelation. Despite skepticism from the girls, a DNA test confirms her relation to Tenchi. Washuu speculates that Mayuka is a product of a time distortion from the future. As the family adjusts to this truth, Ryouko Hakubi alone perceives a dark presence veiled by Mayuka's facade.