At Shinryou Private Academy—an expensive school for wealthy students—one would never expect to find the poverty-stricken Suigin Riku. When he is not working on one of his many part-time jobs to pay his tuition, he can often be found playing the RPG game Dungeon Century, where he has cultivated a relationship with an online friend. However, when Dungeon Century shuts down, he finds out that his crush, the kind-hearted Rei Riku, and his online friend are the same person. But in the aftermath of this revelation, Rei gets kidnapped and taken into Grave Buster, which is a new online game from the creators of Dungeon Century, forcing Suigin to enter the harsh new world of a pay-to-win game in order to save her. Gin no Guardian 2nd Season continues Suigin's quest to rescue Rei, while attempting to solve the mysteries of this strange game. [Written by MAL Rewrite]

Hatsuki is a highschool student living with her sister, Hatsumi, who she has a huge crush on. On Hatsumi's 16th birthday, she is suddenly surrounded by a green light and disappears in front of Hatsuki. She manages to follow Hatsumi with the help of a being resembling a fat baby chick (literally), ending up in a place called "The Great Library", which is full of different worlds stored in books. Hatsumi wasn't there, though, so the search for Hatsuki's great love begins and involves traveling from book to book. (Source: AniDB)

Hina Satou is a 13-year-old who loves figure skating and lives in a port town in Miyagi Prefecture. After losing her mother in the 2011 earthquake, she and her father are currently living in temporary housing. With sad memories of the earthquake and memories of a gentle mother, the cheerful Hina continues to move toward her dreams.

Alien invaders take over Great Mazinger who is at the entrance of a museum next to Mazinger Z as symbols of peace. Grendizer fights the evil invaders and Great Mazinger is recovered. 

When the Vegan empire dispatches a new general to oversee the takeover of Earth, he quickly manages to capture Koji Kabuto and, learning of Great Mazinger through interrogation, quickly commandeers it from a museum where it was kept as a symbol of peace. 

It is now up to Duke Fleed aboard Grendizer to stop humanity's former defender from becoming its destroyer.

(Source: ANN)