At the end of the second semester of third year of high school, four students are prepared for graduation and feel the ending to their high school life. But that changes a little with the arrival of a transfer student.

Akihabara is the center of the universe for the coolest hobbies and quirkiest amusements. In the spring of 1999, bright-eyed Nagomi Wahira moves there with dreams of joining a maid café. She quickly dons an apron at café Ton Tokoton, AKA the Pig Hut. But adjusting to life in bustling Akihabara isn't as easy as serving tea and delighting customers. Paired with the dour Ranko who never seems to smile, Nagomi must do her best to elevate the Pig Hut over all other maid cafés vying for top ranking. Along the way she'll slice out a place for herself amid the frills and thrills of life at the Pig Hut. Just when Nagomi's dreams are within her grasp, she discovers not everything is as it seems amid the maid cafés of Akihabara.

Japari Park is an enormous integrated zoo built somewhere in this world. A mysterious substance found there, called "Sand Star," causes the animals to turn into humanoid beings called "Animal Girls"! These new creatures spend every day peacefully with the zoo's visitors... but after some time, a lost child turns up in the park. The child's attempt to find the way home turns into a great adventure with the Animal Girls!

In this world, creatures like vampires and werewolves still walk about, but Aya Rindo can’t say the same for herself. This beautiful disembodied head, carried by her maid Shizuku Hasei, is a detective in search of her stolen body. One evening, they meet half-human Oni Slayer Tsugaru Shunichi, who offers a lending hand. Now, the trio is traveling through Europe, solving mysteries along the way.