>>281961061
Nyamu did a Mutsumi make-up.
Mutsumi looks at her and thinks it's hers and Nyamu daughter and since she's all grown-up the only reasonable answer is obviously that their daughter is a time-traveler.
It's Dragon Ball's Future Trunk time-machine that Mutsumi is imagining.
Now the real question is who's Mutsumi's favorite DB character. Is she a bejitabro or a gokubro?