Happy World! (2002)

As one of the thousands of Japanese students afflicted with "chunibyo," a state where they're so desperate to stand out that they've convinced themselves that they have secret knowledge and hidden powers, Yuta spent most of his middle school years living in a complete fantasy world. He's finally managing to overcome his delusions but his chunibyo have attracted the attentions of another sufferer, and she's decided that this makes him her soul mate.

Humans live in the world of Assiah, demons in Gehenna. The two dimensions are not meant to interfere with each other, but demons still possess creatures in Assiah in spite of this. The humans who can fight these demons are known as exorcists. Rin Okumura is a boy who bears the curse of being Satan's illegitimate son. His foster father sacrificed himself to save him from demons. To avenge his foster father's death as well as to prove himself, Rin decides to follow the path of an exorcist and defeat his own father, Satan. To hone his raw skills, Rin enters True Cross Academy to train with other exorcist candidates.

Reach the top, and everything will be yours. At the top of the tower exists everything in this world, and all of it can be yours. You can become a god. This is the story of the beginning and the end of Rachel, the girl who climbed the tower so she could see the stars, and Bam, the boy who needed nothing but her.

Shiina Aki is constantly being treated like a girl due to his feminine looks so he decides to move to Tokyo to attend middle school in an attempt to change himself. However what awaits him in his new home, Sunohara-sou, is the kind-hearted caretaker, Sunohara Ayaka. Along with the three female members of Aki's new middle school's student council, Yukimoto Yuzu, Yamanashi Sumire & Kazami Yuri. And so begins Aki's new life in Tokyo living with 4 girls.

After failing his college entrance exams, 18 year-old Tsukasa Mizugaki is offered a position at the renowned SAI Corporation, known for its production and management of Giftia, androids that possess human emotions. Tsukasa’s position is in the terminal service department where the main job is to recover Giftias that are close to their expiration, a graveyard department in every sense. To make matters worse, Tsukasa is ordered to work with Isla, a female Giftia who is never given any responsibility other than serving tea to co-workers.

Hitori Bocchi, a girl with extreme social anxiety, has had only one friend throughout elementary school. When Bocchi learns they'll be split up after graduation, she makes a promise to her: "By the time of my middle school graduation, I'll make friends with everyone in my class." And if she can't... they won't be friends anymore?! But Bocchi has a hard time talking to people. When she gets nervous, her legs cramp. She can't look other people in the eye. She doesn't even know how to make friends! Every way she thinks of to make friends ends up failing. Will her friend-making plan pay off?!

The Hidden Dungeon is a place of legend where rare treasures and items are hidden. Nor, the third son of an impoverished noble family who's lost the one job offer he had, was lucky enough to hear about this dungeon. He then acquires a skill that allows him to create, bestow, and edit skills... and in order to use it, he needs to accumulate points by carrying out such tasks as eating delicious meals and doing sexual things with alluring members of the opposite sex.

In the year 2138, virtual reality gaming is booming. Yggdrasil, a popular online game is quietly shut down one day. However, one player named Momonga decides to not log out. Momonga is then transformed into the image of a skeleton as "the most powerful wizard." The world continues to change, with non-player characters (NPCs) beginning to feel emotion. Having no parents, friends, or place in society, this ordinary young man Momonga then strives to take over the new world the game has become.

Demon King Daimao follows Akuto Sai as the lead character, who on the day he enters Constant Magic Academy, receives a very unexpected future occupation aptitude test result: “Demon King.”

Issei Hyodo is your average perverted high school student whose one wish in life is to have his own harem, but he's got to be one of the unluckiest guys around. He goes on his first date with a girl only to get brutally attacked and killed when it turns out the girl is really a vicious fallen angel. To top it all off, he's later reincarnated as a devil by his gorgeous senpai who tells him that she is also a devil and now his master! One thing's for sure, his peaceful days are over. In a battle between devils and angels, who will win?