Takumi, a gifted chef, was just let go from his job. He lands a gig at an old boarding house called Astro-sou but hesitates to accept after learning he must also live there full-time. That is until he meets the beautiful and charming caretaker, Mira, and he is sold. The two begin to work together, and their connection deepens. But Mira has a secret: she is not from this world!

The story tells the story of a blood-red moon suddenly appearing in the sky, which is known as the red moon event in history. The remaining survivors had to hide in the city protected by high walls. Among the survivors, some people also suffered from mental mutations. Among them, those who could not control their own mental mutations would emit mental plague and radiation. It contaminates the normal people around it and poses a great threat to the surviving humans. In order to solve the source of the pollution, High Wall City established a special pollution cleanup department, recruiting people who can control spiritual energy, and our protagonist Lu Xin is applying for the most dangerous cleanup department!

Shidou Itsuka faces greater peril than ever due to his continued involvement with Ratatoskr. He has already sealed 10 Spirits, and Isaac Westcott, leader of Deus Ex Machina Industries, has finally decided to kill Shidou and plunder the Spirits' powers for himself. To achieve his goal, Isaac declares an all-out war against Ratatoskr, forcing the organization to exhaust its resources to ensure Shidou's survival. Despite being severely outnumbered and outmatched, a glimmer of hope exists in the form of the Spirit of Time, Kurumi Tokisaki. Shidou must seal and acquire Kurumi's power to travel to the past and confront the Spirit of Origin—the catalyst that started it all.

Set on the planet Yietta, whose colonists make their living by exploiting the planet's unique liquid-gas oceans, Plastic Little begins as the Yietans are finally about to pay off their debts to the Galactic Federation. Unfortunately, there are those who would rather not let Yietta slip through their fingers... Enter Tita, 17 year old captain of the Cha Cha Maru. Together with her crew, Tita specializes in capturing Yietta's exotic life forms for intergalactic pet shops, but through plain bad luck she finds herself, instead, at the core of a sinister plot to take over Yietta! By rescuing 16 year old Elysse from the very clutches of the military, Tita puts the lives of both herself and her crew in mortal peril... but a girl's got to do what a girl's got to do! As the plotters mobilize their forces in a desperate bid to retrieve Elysse, whom they believe possesses a vital computer code, Tita must play a dangerous game of tag with an entire army of professional killers! It's Cat and Mouse on a planetwide scale, with one crucial difference: Mice don't shoot back, but Tita's does!