While saving a child from harm, otaku Asahi Ikusaba is transported to another world and believes he has reincarnated with cheat skills similar to those of the characters from his favorite games and novels. Unfortunately, reality strikes when an encounter with a powerful monster shows that he is still nothing more than an average person. In this moment of extreme danger, Asahi instinctively calls out to his overly doting sister, Maya, who appears out of nowhere, possessing the overpowered abilities he thought he had. Maya is ecstatic to see her brother again and resolves to use her newfound powers to protect Asahi no matter what. Together, the close-knit siblings attempt to find a way back home while enjoying their new lives. However, it soon becomes clear that their arrival in this world may have had a purpose. With the Demon King's overwhelmingly powerful army approaching, no one but Maya seems to be able to stand in its way.

Earth's once green hills and rich blue oceans have been converted into a desolate wasteland by the relentless onslaught of planet bombs from the expansionist Gamilas Empire. By the year 2199, humankind has retreated to the depths of underground cities to escape the radiation. However, all hope is not lost, as the distant planet Iscandar offers Earth its final salvation: the Cosmo Reverse System, capable of restoring Earth's irradiated surface. In a desperate bid to retrieve this technology from Iscandar, the Earth Defense Force pours its remaining resources into the Yamato—an innovative, state-of-the-art battleship equipped with an infinite energy Wave Motion Engine. From young talent such as Tactical Officer Susumu Kodai to accomplished veterans like Captain Juuzou Okita, the Yamato's crew consists of many individuals, all varying in their experience on the battlefield. But despite their differences, one goal unifies them all: to complete their perilous 168,000 light-year voyage to Iscandar and save humanity from imminent doom.

R-15 is about a boy, Taketo Akutagawa, who attends a school for geniuses: Inspiration Academy Private High School. Taketo is a genius novelist and writes erotica. Despite negative perceptions many people have of him, he aims to be at the top of his class and be recognized as the world's greatest writer. (Source: Wikipedia)

The main character, a cat named Nyatto, embarks upon a journey to save his sister's soul, which was ripped in two when Nyatto tried to save her from Death. She trails after him, brain-dead. They encounter many brilliant, mind-bending situations, beginning with a disturbing magic show. (Source: ANN)