—Do you know the Nejen? If you know it, then I'll take you there— The year is U.C. 0105. Twelve years have passed since the end of the second Neo Zeon War (Char's Rebellion). Even after "the Axis Shock," which seemed to indicate the future of humanity and the Universal Century, the world is still in a chaotic situation where intermittent military conflicts continue to break out. The Earth Federation government is more corrupt than ever, and its leadership has not only accelerated Earth's pollution, but also implemented an inhuman "Man Hunting" policy in which civilians are forcibly exiled to outer space. The anti-Federation government organization "Mafty," led by someone called "Mafty Navue Erin," has taken a stand against the corruption of the Earth Sphere. Mafty carries out fierce acts of terrorism, assassinating high officials of the Federation government one after another, but it gains a certain level of support from the populace who are growing more opposed to the Federation government. The person who calls himself "Mafty" and leads this organization is Hathaway Noa, the son of Bright Noa, an officer of the Earth Federation Forces who once participated in the One Year War. Hathaway himself joined the forces trying to stop Char’s Rebellion. With firsthand knowledge of the ideals and ideologies of Amuro Ray and Char Aznable, he has become a warrior following in their footsteps, and plans to clear a path forward through armed resistance. His destiny, however, is drastically altered as he encounters the Federation Forces officer Kenneth Sleg and a mysterious young beauty named Gigi Andalucia. (Source: Gundam.info)

In a quiet corner of the city, four-year-old Kun Oota has lived a spoiled life as an only child with his parents and the family dog, Yukko. But when his new baby sister Mirai is brought home, his simple life is thrown upside-down; suddenly, it isn't all about him anymore. Despite his tantrums and nagging, Mirai is seemingly now the subject of all his parents' love.

To help him adapt to this drastic change, Kun is taken on an extraordinary journey through time, meeting his family's past, present, and future selves, as he learns not only what it means to be a part of a family, but also what it means to be an older brother.

[Written by MAL Rewrite]

The movie is a compilation of episodes 1-8 of the 2017 television series with new scenes added for the introduction. It covers the period from when Riko descends into the Abyss with her robot companion Reg, reaching the second layer where they meet the White Whistle Ozen who reveals information about Riko's mother. (Source: Wikipedia)

The movie is a compilation of episodes 9-13 of the 2017 television series. Riko and Reg descend to the third layer where Riko has her first experience of the Curse. They descend to the fourth layer where Riko's arm is injured by an Orbed Piercer and Reg tries to save her. Nanachi comes to their aid and saves Riko's poisoned arm. In return Nanachi asks Reg to kill her immortal companion Mitty. Nanachi then joins Riko and Reg in their quest to reach the bottom of the Abyss. (Source: Wikipedia)