In the year 2005, a race of alien monsters called Zonders emerge from underground and launch a series of attacks on the city of Tokyo. The only defense against these creatures is the secret agency known as the Gutsy Geoid Guard (or 3G) and their ultimate weapon, the awesome giant robot GaoGaiGar. GaoGaiGar's pilot, Guy Shishio, is a former astronaut who was nearly killed two years before when the Zonders first crashed to earth. Guy's life was spared when a mysterious robot lion called Galeon pulled him from the burning shuttle and brought him to Earth. Guy's father, Leo, then used Galeon's technology to rebuild his shattered son as a cyborg, in the hopes that he could stop the aliens when they appear. Now, with Galeon as its core, GaoGaiGar fights to protect Earth. He is aided by a team of transforming robots and by a young boy named Mamoru, who has the power to purify the Zonders' cores, and seems to be connected to the mysterious Galeon. (Source: ANN)

Mikiya Kokutou gives Shiki Ryougi a cat to watch, as he will be away for a little while. Though Shiki protests, he leaves the cat anyway, and Shiki is stuck trying to understand her new feline companion. But as luck would have it, the cat seems to have taken a liking to Mikiya and misses him. Later in another part of the city, Ririsu Miyazuki visits the place where her dear friend committed suicide. She intends to end her life as well, but she meets Fujino Asagami, a blind classmate with a traumatic past. Though the two girls don't have much in common, Asagami reminds Miyazuki of her lost friend and helps her understand her pain. Two months later, Mikiya elects to celebrate New Year's with Shiki instead of his family, which makes his sister Azaka very upset, leading to her spending the holiday with her school friends. As the snow begins to fall, Mikiya reflects on what he wishes for most of all: that Shiki's life be filled with happiness.

After World War III decimated the world's population and rendered large amounts of land uninhabitable, various private military contractors began using combat androids—also known as T-Dolls—to maintain peace in unstable countries. While they are physically superior to flesh-and-blood fighters, T-Dolls are incapable of formulating complex plans and thus require a human commander to issue orders. Sangvis Ferri was an industry-leading T-Doll manufacturer until they attempted to install a specialized T-Doll as the company's sole commander—resulting in the immediate deaths of everyone at that facility. Seizing control of Sangvis factories, the rogue AI declared war on the remnants of mankind. Now facing a hostile robot invasion, Griffin & Kryuger is the only paramilitary organization strong enough to withstand confrontation and halt their destructive advances. Investigating the events related to Sangvis Ferri's aggression, the elite task force Team Anti-Rain searches for highly confidential information in an abandoned warehouse, but they are shortly ambushed. Hoping to safeguard their findings, the group temporarily disbands and each Doll goes into hiding. Meanwhile, the lazy but gifted Gentiane is hired by Griffin as a rookie commander and given her critical first mission—track down Team Anti-Rain and recover the classified data before Sangvis Ferri can.

When Seikichi Kuroda—self-proclaimed guardian and head thug of Hekikuu High School—hears rumors of a first-year transfer student named Seiichirou Kitano terrorizing his entire class, Seikichi tries to intimidate him through authority. However, things go awry when he witnesses something horrifying—Seiichirou has a face so dreadful and haunting that even Seikichi hurries away in fear. But despite his menacing appearance, Seiichirou has a heart of gold. Inhibited by his poor communication skills and fear-inducing looks, he has never managed to convey his true self to his terrified peers, resulting in his lifelong ostracization. Now the new guardian, Seiichirou discovers that sometimes friends can be found in the most unlikely places and through the most unusual circumstances.