Fifteen years have passed since the war between humans and demons began. Dissatisfied with their slow advance into the Demon Realm, the Hero abandons his companions to quickly forge ahead towards the Demon Queen's castle. Upon his arrival at the royal abode, the Hero makes a startling discovery: not only is the Demon Queen a woman of unparalleled beauty, but she also seeks the Hero's help. Confused by this unexpected turn of events, the Hero refuses to ally himself with his enemy, claiming that the war the demons have waged is tearing the Southern Nations apart. However, the Demon Queen rebuts, arguing that the war has not only united humanity but has also brought them wealth and prosperity, providing evidence to support her claims. Furthermore, she explains that if the war were to end, the supplies sent by the Central Nations in aid to the Southern Nations would cease, leaving hundreds of thousands to starve. Fortunately, she offers the Hero a way to end the war while bringing hope not only to the Southern Nations, but also to the rest of the world, though she will need his assistance to make this a reality. Finally convinced, the Hero agrees to join his now former enemy in her quest. Vowing to stay together through sickness and health, they set off for the human world. [Written by MAL Rewrite]

The second season of Morita-san wa Mukuchi that directly follows the first.

Morita Mayu, a high school girl. She is extremely reticent and her silence and habit of looking at people's eyes straightly sometimes cause misunderstanding. The reason behind it is not because she doesn’t like to talk nor because she has nothing to say. The reason she rarely speaks is due to the fact she thinks too much before speaking, thus losing the timing to speak altogether. But she lives a happy school life with her classmates.

Chiyo Sakura is a cheerful high school girl who has fallen head over heels for the oblivious Umetarou Nozaki. Much to Chiyo's confusion, when she confesses to her beloved Nozaki, he hands her an unfamiliar autograph. As it turns out, the stoic teenage boy is actually a respected shoujo mangaka, publishing under the pen name Sakiko Yumeno! A series of misunderstandings leads to Chiyo becoming one of Nozaki's manga assistants. Throughout the hilarious events that ensue, she befriends many of her quirky schoolmates, including her seemingly shameless fellow assistant, Mikoto Mikoshiba, and the "Prince of the School," Yuu Kashima. Gekkan Shoujo Nozaki-kun follows Chiyo as she strives to help Nozaki with his manga and hopes that he will eventually notice her feelings. [Written by MAL Rewrite]