It is said that every few years, there is what's known as the Summer of Anu. During that summer, thanks to the divine protection of the sky-god Anu, all of the demons in the tower lose their power. The country of Uruk has begun an invasion of the tower in order to suppress the demons. They've built up positions inside the tower, with their sights set on getting to the upper levels. The Uruk army knows that this is the third Summer of Anu-a perfect time to launch a mission to suppress the monster Druaga once and for all. The army soldiers aren't the only ones in the tower, though. An enitre city called Meskia has formed inside the tower's first floor. It plays host not just to soldiers, but also to adventurers who have heard rumors about a legendary treasure called the Blue Crystal Rod, which is said to rest at the very top of the tower. With all these different groups in the mix, each with its own agenda, one can only guess how things will play out during this unusual summer. (Source: Newtype Magazine)

At the end of the 21st century, the discovery of a new energy source called DG energy (short for divine grace energy) has revolutionized Earth's economy and allowed humanity to colonize space. However, when the initial expedition reaches Pluto, they are attacked by a mysterious, giant life-form known as Nergal. The Earth Alliance Army fights back by creating an AG Unit using ancient robot weapons known as the G's Frame which were excavated from archaeological sites all around the world. Girls with special qualities known as Ancient Girls can pilot these robots against the Nergal. However, the first AG Unit suffers heavy casualties in the Jupiter Trojan campaign, and the pilot of Unit 04, Minamiya Reiu, goes missing-in-action... Years later, Minamiya Reika, the younger sister of Reiu, enlists with the AG Unit to search for her sister and to protect the Earth from the Nergal. A story of friendship, ancient robot weapons, and battles to the death with the Nergal ensues. (Source: Crunchyroll News)

With broken spirits and enigmatic questions that hold no answers lingering, Jil is still trying to figure everything out. Then, a mysterious girl named Kai appears before him and says: Take me to the top of the tower. Kai's request shrouded in ambiguity, Jil will have another chance to work towards completing his destiny and ascend the Tower. With his hopes and aspirations seemingly slipping out of his hands, Jil must rise to the challenge once again on this never-ending adventure. (Source: Crunchyroll)