As a young boy from a noble family in Amawakuni, Arata has always expected to make life his own—until word of the princess growing weak reaches his city. Unbeknown to him, his grandmother had claimed him to be female at birth, and now, with no other girls to succeed the princess from the matriarchal Hime clan, he is next in line for the throne! Disguised as a woman awaiting a replacement to be found, Arata witnesses an assassination attempt on the princess by none other than her own guard, the 12 Shinsho. The crime is pinned on his head, forcing Arata to escape to the Kando forest, where it is said that no one comes out the same. Meanwhile, in modern-day Japan, Arata Hinohara longs for escape from the cruelty of his classmates. Hearing his name called from an alley, he wanders from his path and unwittingly switches universes with Arata from Amawakuni. With his own power as a newly awakened "Sho"—a warrior able to wield Hayagami, weapons with the power of the gods—and the help of his companions he meets along his journey, Hinohara sets out to restore order to this new world. [Written by MAL Rewrite]

One day, while being attacked, Chang Tian unintentionally invokes an artifact called Xiao Bai that protects him from a terrible fate. After this, he finds himself on a battlefield, where he will fight alongside several other people like him, able to invoke artifacts...

On his way home from school, Tatsumi sees a man collapsed near a lake. When he approaches him, Tatsumi notices something strange: the person in need of help is actually a beautiful merman named Wakasa! Because Wakasa's home has become too polluted to live in, Tatsumi graciously offers his bathtub as a refuge. With a boisterous merman as his new roommate, Tatsumi's normal life won't be returning anytime soon, not to mention Wakasa's aquatic friends—Takasu, Mikuni, and Maki—often show up uninvited, making them all quite a handful for the high school student. As he humors their curiosity for human life, Tatsumi sometimes finds himself enjoying their childish antics, but he will have to keep his cool if he intends to keep up with his daily life and newfound friendship. [Written by MAL Rewrite]

Chika Homura begins her high school career with a goal: to develop a "cute girl" persona. After quitting the volleyball team despite her all-star status, Chika decides to join her school's underrated Wind Instrument Club and play the flute, believing it to be the most delicate and feminine instrument. For the first time in nine years, Chika reunites with her childhood friend and total opposite, Haruta Kamijou. Unfortunately for Chika, Haruta is not fooled by her efforts to become more endearing. But this does not deter Chika, and she develops a crush on the band instructor, Shinjirou Kusakabe—but so does Haruta! However, Chika's high school life just won't go according to plan, as mysteries begin appearing around her and her friends. The club members must work together to solve the mysteries plaguing the school, all while trying to find more members to compete in musical competitions. [Written by MAL Rewrite]