The tale begins around the end of the 3rd season...

Even with Nobuyuki and Rea's wedding coming up in a few days, the Masaki household, though busy with
preparations for the wedding, their everyday situation is still par for the course for the Masaki house.
In space too, people connected to the Masaki house are making preparations in order to attend the wedding.
Airi is battling mountains of paperwork, and Funaho, who can't attend the wedding because the survival of
Yosho hasn't been made public, gives her wedding gift to Minaho.
A few days before the wedding, people connected to the Masaki house gather on earth and Tenchi meets his aunt Minaho.
"...she reminds me of mom..." that's Tenchi's first impression, quite natural as she's also Airi's daughter.
The scent of trouble is in the air..
Mizune, don't overdo it and put 
Tsukiko-chan into a rotten mood.
ميزوني، لا تُبالغي في ذلك وتعكّري مزاج تسوكيكو-تشان
Mizune, pass auf, dass du
dich nicht zu sehr gehen lässt
Mizune, ni se te ocurra desmoralizar
a Tsukiko y aguar la fiesta.
Mizune, ni se te ocurra desmoralizar
a Tsukiko y aguar la fiesta.
Mizune, ne t’avise pas
de poursuivre Tsukiko
Mizune, vedi di non esagerare, 
altrimenti finirai per rovinare l'umore a Tsukiko-chan.
Mizune, não exagere e
deixe a Tsukiko vigilante.
Мидзунэ, смотри не перестарайся
и не испорть Цукико настроение.