Sousuke Kaburaya, an impoverished detective, meets Sara, a princess from another world with magical powers. They start living together, and Sara quickly adjusts her life to modern Japan.

Wisteria is an orphan girl living in a corner of the British Empire at the end of the 19th century. Her life is desolate and bleak–until she encounters Marbas, a powerful but equally lonely immortal being with a furry appearance, hounded by hunters. Together, Wisteria and Marbas roam the Empire–populated by humans and human-like beasts–in search of a place where they can live together in peace.

When the "Sirens," an alien force with an arsenal far surpassing the limits of current technology, suddenly appeared, a divided humanity stood in complete solidarity for the first time. Four countries—Eagle Union, Royal Navy, Sakura Empire, and Iron Blood—formed Azur Lane, paving the way for the improvement of modern warfare, which led to an initial victory against the common threat. However, this tenuous union was threatened by opposing ideals, dividing the alliance into two. Sakura Empire and Iron Blood broke away and formed the Red Axis, and humanity became fragmented once again. As a seasoned and experienced fighter, the "Grey Ghost" Enterprise shoulders Azur Lane's hope for ending the war. But behind her stoic persona hides a frail girl, afraid of the ocean. Even so, she continues to fight as she believes that it's the only purpose for her existence. Meanwhile, Javelin, Laffey, and Unicorn—three ships from the union—stumble upon Ayanami, a spy from the Red Axis. Strange as it may seem, they try to befriend her, but as enemies, their efforts are for naught. Still, they persevere in hopes of succeeding one day. Amidst the neverending conflict within humankind, the keys that could unite a fragmented race might exist: a soldier coming to terms with her mysterious personality and camaraderie between those with different ideals. [Written by MAL Rewrite]

In an attempt for survival, Yu Renjie, the son of the demon lord, was ordered to enter Hero's Academy which only recruits distinguished and upright disciples. The goal is to obtain a Hero's Certificate which can bring legitimacy to the demon clan. This is extremely dangerous. Once the identity of a demon cultist is exposed, countless righteous knights will kill them on the spot. But on the first day of school, Yu Renjie was shocked to find out that his personal information had been leaked. In order to hide his identity, he had no choice but to put on women's clothing. His dangerous and hilarious campus life is about to unfold!