ข้อมูลอนิเมะTokyo Magnitude 8.0

Mirai Onosawa and her younger brother Yuki are visiting a robot exposition at Odaiba, Tokyo, when a massive earthquake strikes the city.

Mirai looks desperately for Yuki after the earthquake inside a colapsing building along Mari Kusanabe, a female motociclist courier who offered herself to help her.

Mirai, Yuki and Mari decide to reach their homes together, but just after starting their journey, they find that there are far more dangers in the colapsing city than they imagined.

Having finally left Odaiba, the trio find a place to gather supplies and prepare theirselves for their long walk, but after having a discussion, Mirai and Yuki stray from Mari and end up in serious trouble.

Mirai and company take shelter at her school's premises during the night, but their stay becomes far from peaceful as they are constantly plagued by aftershocks and depressed by the sight of those who lost their relatives to the earthquake.

The group reaches Mari's workplace, where she loses conciousness because of amenia. During that time the kids are suddenly frightened by Aya, a colleague of Mari, who noisily enters the building carrying a baseball bat.

Rescue robots fill the scene, fascinating Yūki and leading him to meet a new friend, who shares his interest and is the same age as Mirai. However the journey so far seems to have taken its toll on Yūki.

Yūki collapses suddenly and is taken to the hospital, where Mirai agonizes over her brother's fate.

Mari finally reaches her home, only to find out that her house was destroyed and the fate of her mother and daughter remains unknown. Mirai and Yūki decides to help and discover that there is a near by elementry that is caring for the resident. On arrival Mari believes that two unknown bodies were those of her mother and daughter, thus mourning for a period of time. But Yūki, who believes that Mari mother and daughter are still alive, convince his sister to help look for them. Mari's daughter is discovered in a near by elementary school, that was also a shelter to the resident. Mari is reunited with her daughter, but still has no idea where her mother could have been. Mari discover her mother at a hospital and is reunited. Mirai, feeling happy for Mari, decides to leave with Yuki to go to their parents. Before leaving, Mirai writes a note to Mari thanking her for all that she has done for them. Mirai end the letter with hope that soon she and Yuki will meet Mari again, after things have calm down. But in confused and susprised reaction Mari says "Yuuki and I?" While on a truck heading towards their destination Yuki is about to tell Mirai something.