The Daichis: Earth's Defense Family

In the not-so-distant future, the Daichi Family are in the middle of a breakdown as the parents face divorce. Suddenly, they receive a mysterious fax asking them to "Save the Earth". Later in the afternoon, a comet-like object is closing in on the Earth.

In order to defeat the monster, the Daichi Family must fight together! However, Seiko is refusing and preparing to just leave everyone behind. Mamoru follows and attempts to persuade her to join the battle.

After news reports of the battle, they are instructed to keep their mission a secret. Nozomi believes this is an unreasonable situation while Seiko believes this is one of Mamoru's plans to keep them together.

Dai swallows a mysterious ball and his belly swells as if he was pregnant. After giving "birth", a strange organism appeared. He names the organism "Weird" but the family wants him to get rid of his "child".

The Daichis are sent into space to fight. Using the Mighty Robo, they proved successful. However, a bill has been sent to them for every item they have used thus far. Seiko suggests to begin training to learn how to fight without using expensive items.

Tired from last night's training, Seiko insists they continue their training daily so their debt doesn't grow. Nozomi wants to go to a concert but shows up anyway and waits for everyone else. Mamoru and Dai eventually arrive but Seiko has yet to.