Aspiring manga artist Mizuho Nishino has grown alongside her four childhood friends: Kizuki Hazawa, Shuugo Hoshikawa, Shin Kashiwagi, and Airu Izumi. But on Mizuho's 17th birthday, Kizuki suddenly asks to be her boyfriend. Having no previous experience with romance, Mizuho brushes it off easily, but Kizuki is genuine and intends to win her heart. Kizuki no longer hides his affections, and Mizuho hesitates, worried about the consequences their potential relationship could have on their whole friend group. As Mizuho works through the confusion of youth, it seems that the other three boys have fallen for her as well—and she must find a way to sort her feelings out without shattering the close-knit group she holds dear.

In a not-too-distant future, humanity has established a loosely organized world government with everything managed by an international AI network called Sapientia. People live peaceful lives by loyally obeying its rational decisions. However, Sapientia's lunar development project, which sends criminals and pollutants to the Moon to maintain Earth's peace, creates disparity and poverty on the Moon, sparking a catalyst for war. Jacob "Jack" Shadow gets caught up in this conflict after losing his family to a terrorist bombing by the Moon's rebel army. Vowing revenge, Jack joins the Earth army as a scout on the Moon, only to discover an unexpected leader among the resistance forces.

In a future to come humanity enjoys a new age of prosperity thanks to Dr. Shizuma's invention of a revolutionary renewable energy source: the Shizuma Drive. But this peace is threatened by Big Fire, a cabal seeking world domination. Against Big Fire the International Police Organisation dispatches a collection of superpowered warriors and martial artists, together with Daisaku Kusama, inheritor and master of Earth's most powerful robot, Giant Robo. By capturing an abnormal Shizuma Drive which is essential to Big Fire's plans the IPO ignites a desperate conflict between the two groups. The coming battle will test Daisaku's resolve to the utmost, reveal the ghastly truth behind the creation of the Shizuma Drive, and bring human civilization to its knees! Giant Robo is a character-driven adventure in a retro-futuristic setting, drawing on influences from opera, kung-fu cinema, wuxia stories and classic mecha anime. It incorporates characters from the works of the manga author Mitsuteru Yokoyama but it is designed to be a stand-alone story.

Gaiarth - a world devastated by a cataclysmic war, where pockets of humanity struggle to survive amidst the wreckage of technologies made magical by ignorance. Gaiarth - a world where artificially intelligent machines doggedly pursue their programmed imperatives: to protect, or destroy, humanity. Gaiarth - a world in which an old and terrible evil has reawakened, threatening to once again bring forth Armageddon!