Living by the sea, protecting the sea, and journeying across the sea... They're the Blue Mermaids! Because of a shift in tectonic plates around 100 years ago, Japan lost much of its area to submergence. To preserve Japan's territories, coastal cities sprung up, one after the other. Eventually, they became marine cities, and along with the expansion of sea-lanes to connect them, the need arose for a sizable staff to protect the seas. At the same time, maritime jobs were becoming more popular among women. Hence, the Blue Mermaids, tasked with keeping the seas safe, had become every female student's dream job. This is when childhood friends Akeno Misaki and Moeka China enroll in a marine high school in Yokosuka, along with other girls who share their goal of becoming a Blue Mermaid.

Every few years, beautiful female warriors from across the land compete in the Queen's Blade Tournament to become the ruler of the land. It's a series that loves violence as much as it hates clothes and complicated plots.

In 4 years time the competition that will decide who the next Queen shall be will start. The strongest warrior will continue to rule the country according to tradition and expand it. The contestants need only be older than 12 years. They need not be human, intelligent or even of that country. The rules for the tournament are simple: murder is allowed. Any weapon can be chosen. The winner is decided when one of the participants flees or can't move anymore. Such event is broadcast through a crystal sphere by the court's magic teacher to all population to see and enjoy.

The story is about Rito Yuuki , a high-school boy who cannot confess to the girl of his dreams, Haruna Sairenji. One day when coming home and sulking in the bathtub a mysterious, nude girl, appears out of nowhere. Her name is Lala and she comes from the planet Deviluke, where she is the heir to the throne. Her father wants her to return to her home planet so she can marry one of the husband candidates, but she decides that she wants to marry Rito in order to stay on Earth.

season of To Love Ru

Squid Girl has come to the land from the depths of the sea to conquer humanity in revenge for pollution of the ocean. Unfortunately she ruins the first house she uses as an invasion base and has to work to pay for repairs. Of course, she can't overcome the Aizawa sisters who manage the house, so who knows whether she can subjugate humankind.

Kojou Akatsuki's days as an ordinary high school student in the Demon District of Itogami Island come to an abrupt end after a fateful encounter leaves him with the remarkable abilities of a vampire. It isn't long before he is thrust into the center of attention when it is discovered that he is the fourth primogenitor, an immensely powerful vampire whom most consider to be merely a legend. Fearing Kojou's destructive potential, the Lion King Organization sends in an apprentice sword-shaman, Yukina Himeragi, to monitor, and should he become a threat, kill the boy deemed the world's most powerful vampire. Forced together by circumstance, the two form an unlikely alliance as Kojou comes to terms with his abilities and they both struggle to protect the city from various emerging chaotic forces.

After experiencing the numerous trials encountered on her journey, Reina has grown as a warrior. Determined to take part in the Queen's Blade tournament, she arrives at the capital city Gainos, where Queen Aldora awaits. There gathers a number of beautiful warriors who, like Reina, are there for the Queen's Blade.

Amongst them is Reina's sister, Claudette, determined to restore the glory of House Vance; Tomoe and Shizuka, who are both fighting for their homeland of Hinomoto; Nanael who has been ordered to participate by the Archangel; and the subordinates of the Marshland Witch.

All these beautiful fighters who gather in Gainos have been one objective, to win through the Queen's Blade, the tournament to select the strongest, most beautiful queen. Who would ascend to that glorious throne? That can only be determined via battle.

The story is set four years after the first storyline and revolves around Annelotte, the rebelling knight princess who stands up to the tyranny of the new queen.