In a world where humans coexist with androids called Neans, a group known as the Immortal Nine rises up against society. Tasked with disposing of the revolters, a Nean named Rouge Redstar (aka Metal Rouge) and investigator Naomi Orthmann head to Mars to track them down…but first, Rouge wants some chocolate.

Outside the magical barriers lies a world overrun by fiery beasts known as Flame Demons, and the only ones who can protect humanity are the Fire Hunters. In the dark woods where the beasts roam is where Touko, a young villager, is rescued from attack by one of these skilled trackers, Koushi. But their meeting was no accident, and a new destiny begins.

When bashful Miyano meets brash Sasaki, it feels like a teen romance manga come to life — but for these boys, real-world love is messier than fiction.

The story centers on Gaku Kitada, a talented mathematics scholar, and Kai Asakura, a young but similarly talented chef. After Gaku suffers setbacks on his dream of becoming a mathematician, he meets Kai as he is running his own food business, and joins Kai in an attempt at something new.